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