#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: yangjunwen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/