diff --git a/du1/program.c b/du1/program.c
index 6e408dd..afc9a96 100644
--- a/du1/program.c
+++ b/du1/program.c
@@ -11,7 +11,7 @@ int main() {
     for (int i = 0; i < VELKOST_POLA; ++i) {
         int value = 0;
         int r = scanf("%d", &value);
-        if(r > 0) {
+        if(r > 0 && value > 0) {
             pole[i] = value;
             participant_count++;
         } else {