#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
using namespace std;

int main(void)
{
    long double t;
    long double n;
    cin >> n;

    t = (sqrtl(1+8*n)-1)/2;

    long long  a = t;

    if((t - a) == 0)
        cout << "YES" <<endl << a <<endl;
    else
        cout << "NO" << endl;

    return 0;

}