import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String N = scan.nextLine();
        scan.close();
        int len = N.length();
        int sum = 0;
        for(int i=0;i<len;i++){
            char digitChar = N.charAt(i);
            int digitInt = Character.getNumericValue(digitChar);
            sum = sum + digitInt;
        }
        if (sum%9==0){
            System.out.println("Yes");
            return;
        }
        System.out.println("No");
        return;
    }
}

/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