import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    String n = sc.nextLine();
	    String[] list = n.split("");
	    int sum = 0;
	    for (int i = 0; i < list.length; i++) {
	    	sum += Integer.parseInt(list[i]);
	    }
	    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