#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: chenjiahui
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/