import java.util.Scanner;

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

		if (t%9 == 0) {
			ans = "Yes";
		}else {
			ans = "No";
		}
		System.out.println(ans);
		sc.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