import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String s=sc.next();
        long n=0;
        long sum=0;
        while (n<s.length()){
            int num=Integer.parseInt(String.valueOf(s.charAt((int) n)));
            sum=sum+num;
            n++;
        }
        if (sum%9==0){
            System.out.println("Yes");
        }
        else {
            System.out.println("No");
        }
    }
}
/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