#include <iostream>
using namespace std;
typedef long long LL;
int main(int argc, char* argv[])
{
	LL n;
	cin>>n;
	LL i=1;
	LL N=0;
	while(true){
		N+=i;
		if (N>=n){
			break;
		}
		i++;
	}
	if (N==n){
		cout<<"YES"<<endl;
		cout<<i;
	}else{
		cout<<"NO"<<endl;
	}
	return 0;
}