import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String n = sc.nextLine();
		int total = 0;
		for (int i = 0;i< n.length();i++) {
			total += Integer.parseInt(Character.toString(n.charAt(i)));
		}
		if(total % 9 ==0) {
			System.out.print("Yes");
		}else {

			System.out.print("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