#include <bits/stdc++.h>
using namespace std;
int main(void){
    long long count=0,x;
    cin>>x;
    for(int i=1;;i++){
        count+=i;
        if(count>x){
            cout<<"NO"<<endl;
            break;
        }else if(count==x){
            cout<<"YES\n"<<i<<endl;
            break;
        }
    }
}