import java.util.Scanner;
class Main {
    public static void main(final String[] args) {
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
        String[] ar = N.split("");
        int sum=0;
        
        for(int i=0;i<N.length();i++){
            sum += Integer.parseInt(ar[i]);
        }
        String ans="No";
        if(sum%9==0) ans = "Yes";
        System.out.println(ans);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz