diff --git "a/leetcode3/\354\265\234\354\233\220\354\244\200/121. Best Time to Buy and Sell Stock.py" "b/leetcode3/\354\265\234\354\233\220\354\244\200/121. Best Time to Buy and Sell Stock.py"
new file mode 100644
index 00000000..848c9133
--- /dev/null
+++ "b/leetcode3/\354\265\234\354\233\220\354\244\200/121. Best Time to Buy and Sell Stock.py"	
@@ -0,0 +1,14 @@
+class Solution:
+    def maxProfit(self, prices: list[int]) -> int:
+        buy = float('inf')
+        sell = 0
+        ans = 0
+        for price in prices:
+            if price < buy:
+                buy = price
+                sell = price
+            
+            sell = max(sell, price)
+            ans = max(ans, sell-buy)
+            
+        return ans