#include <iostream>

int main()
{
    long N;
    bool useFlag = false;
    int num = 0;

    for(int i = 2;i >= N;i++)
    {
        int NN = N;
        while(NN%i == 0)
        {
            NN/=i;
            if(num <= 2)
            {
                num++;
            }
            else
            {
                useFlag = true;
                break;
            }
        }
    }
    if(useFlag)
    {
        std::cout << "YES" << std::endl;
    }
    else
    {
        std::cout << "NO" << std::endl;
    }
    
    return 0;
}