import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String N = sc.next();
		int check_dev9 = 0;
		for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		}

		if(check_dev9 % 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