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