diff --git a/du6/program.c b/du6/program.c
index 625f6c1..ac10b0c 100644
--- a/du6/program.c
+++ b/du6/program.c
@@ -13,6 +13,9 @@ int main(){
     int pocet_mien=0;
 
     scanf("%d\n", &pocet);
+    if(pocet<1){
+        puts("Nespravny vstup");
+    }
     while(fgets(riadok,50,stdin)!=NULL && riadok[0]!='\n'){
         if(riadok[strlen(riadok)-1]=='\n'){
             riadok[strlen(riadok)-1]='\0';