#include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	scanf("%d",&n);
	if (n%3==0){
		cout<<"yes"<<endl;
	}
	else {
		cout<<"no"<<endl;
	}
} 
/**************************************************************
	Problem: 1633
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/