#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

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

    int A; cin >> A;
    if(A <= 5){
        cout << "NO" << endl;
        return 0;
    }
    int l = 1, r = 2;
    int now = 3;
    while(r < A){
        if(now == A){
            cout << "YES" << endl;
            return 0;
        }else if(now > A){
            now -= l;
            l++;
        }else if(now < A){
            r++;
            now += r;
        }
    }

    cout << "NO" << endl;
}