diff --git a/du2/program.c b/du2/program.c
index e5aaff7..21a72a5 100644
--- a/du2/program.c
+++ b/du2/program.c
@@ -11,7 +11,7 @@ int main(){
 		int value = 0;
 		int r = scanf("%d",&value);
 		if (r == 1){
-			if(r < 0 && r > 1000)
+			if(r < 0 || r > 1000)
 				continue;
 			results[i] = value;
 			if(max < results[i]){