diff --git a/5_practice.c b/5_practice.c
index 70d6651..26de1fb 100644
--- a/5_practice.c
+++ b/5_practice.c
@@ -9,7 +9,7 @@ int main() {
 	time_t t;
 
 	// Input the number N
-	
+	scanf("%d", &N);
 	
 	// Locate the memory for x, yr, yi;