#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <iomanip>
#define REP(i,n) for (int i=0;i<(n);++i)
using namespace std;
using ll = long long;
constexpr ll INF = 1LL << 60;
constexpr long double EPS = 1e-10;

long double n;

int main() {
  cin >> n;
  long double m = (sqrt(n * 8.0 + 1.0) - 1.0) / 2.0;
  if (m - floor(m) < EPS) {
    cout << fixed << setprecision(0);
    cout << "YES" << endl << m;
  } else {
    cout << "NO";
  }
  cout << endl;
  return 0;
}