#include<bits/stdc++.h>
using namespace std;
long const mod = 1e9+7;
int main(){
    long a;
    cin >> a;
    long summ = 3;
    for(long i=3;i<=100000000;i++){
        summ += i;
        if(summ % i == a % i){
            cout << "YES"<<endl;
            return 0;
        }
    }
    cout << "NO"<<endl;
    
}