#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long ll;
#define debug(x) cerr << "[" << #x << "] : " << x << "\n";

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

	ll a;
	cin >> a;

	if((a - 3) % 3 == 0) cout << "YES\n";
	else cout << "NO\n";
}