import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();

        char[] chars = s.toCharArray();

        int sum = 0;
        for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        }

        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