import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner reader = new Scanner(System.in);
		String n = reader.next();
		long total = 0;
		for (int i = 0; i < n.length(); i++) {
			total += Integer.parseInt("" + n.charAt(i));
		}
		if (total % 9 == 0) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
		reader.close();
	}
	
}

/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