#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: huanghengyi
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/