diff --git a/overdraft.py b/overdraft.py
new file mode 100644
index 0000000..a4aef8e
--- /dev/null
+++ b/overdraft.py
@@ -0,0 +1,11 @@
+n = int(input())
+balance = 0
+min_balance = 0
+
+for _ in range(n):
+    t = int(input())
+    balance += t
+    if balance < min_balance:
+        min_balance = balance
+
+print(min_balance * -1 if min_balance < 0 else 0)