diff --git a/LeetCode/medium/mini_stack_155.py b/LeetCode/medium/mini_stack_155.py
new file mode 100644
index 0000000..21e1e1f
--- /dev/null
+++ b/LeetCode/medium/mini_stack_155.py
@@ -0,0 +1,20 @@
+class MinStack:
+
+    def __init__(self):
+        self.stack = []
+        self.min_tracer = []
+
+    def push(self, value: int) -> None:
+        self.stack.append(value)
+        val = min(value, self.min_tracer[-1] if self.min_tracer else value)
+        self.min_tracer.append(val)
+
+    def pop(self) -> None:
+        self.stack.pop()
+        self.min_tracer.pop()
+
+    def top(self) -> int:
+        return self.stack[-1]
+
+    def getMin(self) -> int:
+        return self.min_tracer[-1]