#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,i,h=0;
    cin>>n;
    for(i=2;i<n-1;i++){
        if(n%i==0){
            h=h+1;
            break;
        }
    }
    if(h>0){
        cout<<i;  
    }else{
        cout<<"Yes";
    }
}
     
     
/**************************************************************
	Problem: 1061
	User: linlinzi
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/