diff --git a/main.py b/main.py
index e69de29..8157922 100644
--- a/main.py
+++ b/main.py
@@ -0,0 +1,17 @@
+def find_missing(arr: list) -> int:
+    init = 1
+    for n in arr:
+        if n == init:
+            init += 1
+        else:
+            return init
+
+
+def main():
+    print(f"Тест 1: {find_missing([1, 2, 3, 5, 6, 7])}")
+    print(f"Тест 2: {find_missing([2, 3, 4, 5])}")
+    print(f"Тест 3: {find_missing([1, 2, 3, 4, 5, 7, 8])}")
+
+
+if __name__ == '__main__':
+    main()