diff --git a/du2/.program.c.swl b/du2/.program.c.swl
deleted file mode 100644
index ee5b49d..0000000
Binary files a/du2/.program.c.swl and /dev/null differ
diff --git a/du2/.program.c.swm b/du2/.program.c.swm
deleted file mode 100644
index 0339d09..0000000
Binary files a/du2/.program.c.swm and /dev/null differ
diff --git a/du2/program.c b/du2/program.c
index 7360311..e5aaff7 100644
--- a/du2/program.c
+++ b/du2/program.c
@@ -11,6 +11,8 @@ int main(){
 		int value = 0;
 		int r = scanf("%d",&value);
 		if (r == 1){
+			if(r < 0 && r > 1000)
+				continue;
 			results[i] = value;
 			if(max < results[i]){
 				max = results[i];