diff --git a/baekjoon/python/APC_A.py b/baekjoon/python/APC_A.py
new file mode 100644
index 0000000..8395df7
--- /dev/null
+++ b/baekjoon/python/APC_A.py
@@ -0,0 +1,9 @@
+n = int(input())
+count = 1
+for i in range(1, 1_000_001):
+    if i == n:
+        break
+    count += 1
+    if '50' in str(i):
+        count += 1
+print(count)