#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int a;
  cin >> a;
  a *= 2;
  bool ck = false;
  for (int d = 3; d * d <= a; d++) {
    if (a % d)
      continue;
    int tmp = a / d - d + 1;
    if (tmp % 2 == 0 && tmp / 2 >= 1)
      ck = true;
  }

  if (ck)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  
  return 0;
}