diff --git a/hw1/app.py b/hw1/app.py
index 6107b87..cc2546e 100644
--- a/hw1/app.py
+++ b/hw1/app.py
@@ -1,4 +1,5 @@
 from typing import Any, Awaitable, Callable
+import json
 
 
 async def application(
@@ -13,6 +14,110 @@ async def application(
         send: Корутина для отправки сообщений клиенту
     """
     # TODO: Ваша реализация здесь
+    if scope["type"] == "lifespan":
+        while True:
+            message = await receive()
+            if message["type"] == "lifespan.startup":
+                await send({"type": "lifespan.startup.complete"})
+            elif message["type"] == "lifespan.shutdown":
+                await send({"type": "lifespan.shutdown.complete"})
+                return
+
+    if scope["type"] != "http":
+        return
+    path = scope["path"]
+    method = scope["method"]
+    query = scope.get("query_string", b"").decode()
+
+    body = b""
+    while True:
+        message = await receive()
+        if message["type"] == "http.request":
+            body += message.get("body", b"")
+            if not message.get("more_body", False):
+                break
+
+    params = {}
+    for pair in query.split("&"):
+        if "=" in pair:
+            k, v = pair.split("=", 1)
+            params[k] = v
+
+    async def sendJson(status: int, data: dict):
+        body = json.dumps(data).encode()
+        await send({
+            "type": "http.response.start",
+            "status": status,
+            "headers": [(b"content-type", b"application/json")],
+        })
+        await send({
+            "type": "http.response.body",
+            "body": body,
+        })
+
+    if path == "/factorial":
+        nRaw = params.get("n")
+        if nRaw is None:
+            await sendJson(422, {})
+            return
+        try:
+            n = int(nRaw)
+        except ValueError:
+            await sendJson(422, {})
+            return
+        if n < 0:
+            await sendJson(400, {})
+            return
+        result = 1
+        for i in range(2, n + 1):
+            result *= i
+        await sendJson(200, {"result": result})
+        return
+
+    if path.startswith("/fibonacci"):
+        tail = path[len("/fibonacci"):]
+        if not tail.startswith("/"):
+            await sendJson(404, {})
+            return
+        nRaw = tail[1:]
+        try:
+            n = int(nRaw)
+        except ValueError:
+            await sendJson(422, {})
+            return
+        if n < 0:
+            await sendJson(400, {})
+            return
+        a, b = 0, 1
+        for _ in range(n):
+            a, b = b, a + b
+        await sendJson(200, {"result": a})
+        return
+
+    if path == "/mean":
+        if not body:
+            await sendJson(422, {})
+            return
+        try:
+            data = json.loads(body)
+        except Exception:
+            await sendJson(400, {})
+            return
+        if data is None:
+            await sendJson(422, {})
+            return
+        if not isinstance(data, list) or len(data) == 0:
+            await sendJson(400, {})
+            return
+        try:
+            result = sum(data) / len(data)
+        except TypeError:
+            await sendJson(400, {})
+            return
+        await sendJson(200, {"result": result})
+        return
+
+    await sendJson(404, {})
 
 if __name__ == "__main__":
     import uvicorn
diff --git a/hw2/hw/shop_api/main.py b/hw2/hw/shop_api/main.py
index f60a8c6..04c475e 100644
--- a/hw2/hw/shop_api/main.py
+++ b/hw2/hw/shop_api/main.py
@@ -1,3 +1,148 @@
-from fastapi import FastAPI
+from fastapi import FastAPI, HTTPException, Query, Response
+
+from http import HTTPStatus
+from typing import Annotated
+from pydantic import NonNegativeInt, PositiveInt
+
+from shop_api.models import (
+    CartCreatedResponse,
+    CartItemResponse,
+    CartResponse,
+    ItemCreate,
+    ItemPatch,
+    ItemPut,
+    ItemResponse
+)
 
 app = FastAPI(title="Shop API")
+
+_items: dict[int, ItemResponse] = {}
+_carts: dict[int, dict[int, int]] = {}
+_item_id_gen = iter(range(1, 10**9))
+_cart_id_gen = iter(range(1, 10**9))
+
+def _build_cart(cart_id: int) -> CartResponse:
+    items: list[CartItemResponse] = []
+    total = 0.0
+
+    for item_id, quantity in _carts[cart_id].items():
+        item = _items.get(item_id)
+        if item is None:
+            continue
+        available = not item.deleted
+        items.append(
+            CartItemResponse(
+                id=item.id,
+                name=item.name,
+                quantity=quantity,
+                available=available,
+            )
+        )
+        if available:
+            total += item.price * quantity
+    return CartResponse(id=cart_id, items=items, price=total)
+
+@app.post("/cart", status_code=HTTPStatus.CREATED, response_model=CartCreatedResponse)
+async def create_cart(response: Response) -> CartCreatedResponse:
+    cart_id = next(_cart_id_gen)
+    _carts[cart_id] = {}
+    response.headers["location"] = f"/cart/{cart_id}"
+    return CartCreatedResponse(id=cart_id)
+
+@app.get("/cart/{cart_id}", response_model=CartResponse)
+async def get_cart(cart_id: int) -> CartResponse:
+    if cart_id not in _carts:
+        raise HTTPException(HTTPStatus.NOT_FOUND, "Cart not found")
+    return _build_cart(cart_id)
+
+@app.get("/cart", response_model=list[CartResponse])
+async def get_carts(
+    offset: Annotated[NonNegativeInt, Query()] = 0,
+    limit: Annotated[PositiveInt, Query()] = 10,
+    min_price: Annotated[float | None, Query(ge=0)] = None,
+    max_price: Annotated[float | None, Query(ge=0)] = None,
+    min_quantity: Annotated[NonNegativeInt | None, Query()] = None,
+    max_quantity: Annotated[NonNegativeInt | None, Query()] = None,
+) -> list[CartResponse]:
+    carts = [_build_cart(cid) for cid in _carts]
+
+    if min_price is not None:
+        carts = [c for c in carts if c.price >= min_price]
+    if max_price is not None:
+        carts = [c for c in carts if c.price <= max_price]
+    if min_quantity is not None:
+        carts = [c for c in carts if sum(i.quantity for i in c.items) >= min_quantity]
+    if max_quantity is not None:
+        carts = [c for c in carts if sum(i.quantity for i in c.items) <= max_quantity]
+    return carts[offset : offset + limit]
+
+@app.post("/cart/{cart_id}/add/{item_id}", response_model=CartResponse)
+async def add_item_to_cart(cart_id: int, item_id: int) -> CartResponse:
+    if cart_id not in _carts:
+        raise HTTPException(HTTPStatus.NOT_FOUND, "Cart not found")
+    item = _items.get(item_id)
+    if item is None or item.deleted:
+        raise HTTPException(HTTPStatus.NOT_FOUND, "Item not found")
+    cart = _carts[cart_id]
+    cart[item_id] = cart.get(item_id, 0) + 1
+    return _build_cart(cart_id)
+
+@app.post("/item", status_code=HTTPStatus.CREATED, response_model=ItemResponse)
+async def create_item(body: ItemCreate, response: Response) -> ItemResponse:
+    item_id = next(_item_id_gen)
+    item = ItemResponse(id=item_id, name=body.name, price=body.price, deleted=False)
+    _items[item_id] = item
+    response.headers["location"] = f"/item/{item_id}"
+    return item
+
+@app.get("/item/{item_id}", response_model=ItemResponse)
+async def get_item(item_id: int) -> ItemResponse:
+    item = _items.get(item_id)
+    if item is None or item.deleted:
+        raise HTTPException(HTTPStatus.NOT_FOUND, "Item not found")
+    return item
+
+@app.get("/item", response_model=list[ItemResponse])
+async def get_items(
+    offset: Annotated[NonNegativeInt, Query()] = 0,
+    limit: Annotated[PositiveInt, Query()] = 10,
+    min_price: Annotated[float | None, Query(ge=0)] = None,
+    max_price: Annotated[float | None, Query(ge=0)] = None,
+    show_deleted: bool = False,
+) -> list[ItemResponse]:
+    items = list(_items.values())
+    if not show_deleted:
+        items = [i for i in items if not i.deleted]
+    if min_price is not None:
+        items = [i for i in items if i.price >= min_price]
+    if max_price is not None:
+        items = [i for i in items if i.price <= max_price]
+    return items[offset : offset + limit]
+
+@app.put("/item/{item_id}", response_model=ItemResponse)
+async def put_item(item_id: int, body: ItemPut) -> ItemResponse:
+    item = _items.get(item_id)
+    if item is None or item.deleted:
+        raise HTTPException(HTTPStatus.NOT_FOUND, "Item not found")
+    item.name = body.name
+    item.price = body.price
+    return item
+
+@app.patch("/item/{item_id}", response_model=ItemResponse)
+async def patch_item(item_id: int, body: ItemPatch) -> ItemResponse:
+    item = _items.get(item_id)
+    if item is None or item.deleted:
+        raise HTTPException(HTTPStatus.NOT_MODIFIED, "Item not found")
+
+    if body.name is not None:
+        item.name = body.name
+    if body.price is not None:
+        item.price = body.price
+    return item
+
+@app.delete("/item/{item_id}")
+async def delete_item(item_id: int) -> dict:
+    item = _items.get(item_id)
+    if item is not None:
+        item.deleted = True
+    return {}
\ No newline at end of file
diff --git a/hw2/hw/shop_api/models.py b/hw2/hw/shop_api/models.py
new file mode 100644
index 0000000..5631a38
--- /dev/null
+++ b/hw2/hw/shop_api/models.py
@@ -0,0 +1,36 @@
+from pydantic import BaseModel, ConfigDict, Field
+
+class ItemCreate(BaseModel):
+    name: str
+    price: float = Field(ge=0)
+    model_config = ConfigDict(extra="forbid")
+
+class ItemPut(BaseModel):
+    name: str
+    price: float = Field(ge=0)
+    model_config = ConfigDict(extra="forbid")
+
+class ItemPatch(BaseModel):
+    name: str | None = None
+    price: float | None = Field(default=None, ge=0)
+    model_config = ConfigDict(extra="forbid")
+
+class ItemResponse(BaseModel):
+    id: int
+    name: str
+    price: float
+    deleted: bool = False
+
+class CartItemResponse(BaseModel):
+    id: int
+    name: str
+    quantity: int
+    available: bool
+
+class CartResponse(BaseModel):
+    id: int
+    items: list[CartItemResponse]
+    price: float
+
+class CartCreatedResponse(BaseModel):
+    id: int
\ No newline at end of file