import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		solve(s, s.length());
	}

	private static void solve(String s, int len) {
		// TODO Auto-generated method stub
		long sum = 0;
		for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		}
		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