#include <bits/stdc++.h>
#define eps 1e-9
using namespace std;

int main(){
	long double n;
	cin >> n;
	long double kai = (-1+sqrt(1+4*2*n))/2;
	long double check = double(static_cast<long long>(kai));
	if (abs(kai-check)<=eps){
		printf("YES\n%.0f\n",kai);
	}
	else{
		printf("NO\n");
	}
	return 0;
}