#include<bits/stdc++.h>
using namespace std;
int main(){
   int n;
   cin>>n;
   if(n%3==0) cout<<"yes";
   else cout<<"no";
}//1674
/**************************************************************
	Problem: 1633
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/