import java.util.Scanner;
import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();

		int sum = 0;

		for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		}

		System.out.println(sum%9 == 0?"Yes":"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