#include <vector>
#include <iostream>
using namespace std;

int main(void){
    if(false)cout<<"＝も消した";
    int n;
    cin>>n;
    vector<bool>v;
    vector<bool>ans;
    v.push_back(true);
    v.push_back(true);
    while(v.size()<n){
        if(!(n%v.size()))ans.push_back(true);
        v.push_back(true);
    }
    v.push_back(true);
    if(!(v.size()%n))ans.push_back(true);
    cout<<(!(ans.size())?"YES":"NO")<<endl;
}