#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,cnt = 0;
    cin>>n;
    for(int i=2;i<=sqrt(n);i++)
    {
        if(n%i==0)
        {
            cnt+=i;
            break;
        }
    }
    if(cnt != 0)
    {
        cout<<cnt;
    }
    else
    {
        cout<<"Yes";
    }
    return 0;
}
/**************************************************************
	Problem: 1061
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/