#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n%3==0) cout<<"yes";
    else cout<<"no";
    return 0;
}
 
/**************************************************************
	Problem: 1633
	User: panjinyan
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/