#pragma optimise "i'll_die_virgin"
#include <bits/stdc++.h>
#define int long long
#define endl '\n'
using namespace std;
#if __cplusplus >= 202002L
using namespace numbers;
#endif




int32_t main(){
    cin.tie(0)->sync_with_stdio(0);
    //freopen("err.txt","w",stderr);
    cin.exceptions(ios::badbit | ios::failbit);
    auto __solve_tc = [&](auto __tc_num)->void{
        int n;
        cin>>n;
        int cnt =0;
        for(int i =1 ; i<n; i++)if(n%i == 0)cnt+=i;

        if(cnt == n)
            cout<<"yes"<<endl;
        else cout<<"no"<<endl;
    };
    int __tc_cnt = 1;
    // cin >> __tc_cnt;
    for(auto __tc_num = 0; __tc_num < __tc_cnt; ++ __tc_num){
        __solve_tc(__tc_num);
    }
    return 0;
}

/*

*/