#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n%3==0)cout<<"yes"<<endl;
	else cout<<"no"<<endl;
	return 0;
}

/**************************************************************
	Problem: 1633
	User: admin
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/