diff --git a/a1/program.c b/a1/program.c
index 9b922a0..cc5a8df 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -22,6 +22,6 @@ int main(){
         putchar(c);
     }
 }
-    printf(int lines);
+    printf("%d", lines);
     return 0;
 }
\ No newline at end of file