#include <stdio.h>
int main()
{
    int n=0,du,k;
    while (n<=0)
    {
        printf("Vui long nhap n:");
        scanf("%d",&n);
    }
    while (n!=0)
    {
        du=n%10;
        n=n/10;
        k=du%2;
        if (k==0)
        {
            printf("NO");
            break;
        }
    }
   if (k!=0)
   printf("YES");
   return 1;
}