#include <bits/stdc++.h>
using namespace std;
int main(){
    long long n,h=0;
    cin>>n;
    for(int y=1;y<=n-1;y++){
        if(n%y==0){
            h+=y;
        }
    }
    if(h==n){
        cout<<"yes";
    }else{
        cout<<"no";
    }
}
/**************************************************************
	Problem: 1859
	User: huanghengyi
	Language: C++
	Result: Accepted
	Time:350 ms
	Memory:2072 kb
****************************************************************/