diff --git a/du2/program.c b/du2/program.c
index 2ab1a82..a1f4de0 100644
--- a/du2/program.c
+++ b/du2/program.c
@@ -10,7 +10,7 @@ int main(){
 	while(1){
 		int value = 0;
 		int r = scanf("%d",&value);
-		if (r == 1){
+		if (r == 1 && r > 0){
 			results[i] = value;
 			if(max < results[i]){
 				max = results[i];