diff --git a/CPP004_Input.cpp b/CPP004_Input.cpp
index 97a939c..7551127 100644
--- a/CPP004_Input.cpp
+++ b/CPP004_Input.cpp
@@ -2,7 +2,7 @@
 
 using namespace std;
 
-main()
+int main()
 {
     // cin - console input
     int a;