#include <cstdio>

int main()
{
    int k = 0;
    scanf("%i", &k);

    if (!((k % 2) && (k % 3)))
    {
        printf("NO\n");
        return 0;
    }

    for (int i = 5, j = 2; i*i <= k; i += j, j ^= 6)
    {
        if (k % i == 0)
        {
            printf("NO\n");
            return 0;
        }
    }

    printf("YES\n");

    return 0;
}