import java.util.Scanner;
 
public class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    char c[] = sc.next().toCharArray();
    int n = 0;
    int a;
    for(int i = 0; i < c.length; i++){
      a = c[i]-48;
      n += a;
    }
    if(n%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