#include <iostream>
#include <vector>
using namespace std;
int main() {
	int a, a2, b, c;
	cin >> a;
	a2 = a * 2;
	b = a2/(a2 + 1 );
	c = (b + 1)/2;
	// vector<string> answers {"No", "Yes"};
	// cout << answers[c];
	
	cout << (c==0 ? "NO" : "YES");
}