import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
        char[] N = sc.next().toCharArray();
        int res=0;
        
        for(int i=0; i<N.length; i++){
            res = (res + Character.getNumericValue(N[i]))%9;
        }
        
        if(res%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