import java.util.Scanner;

public class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    String N = sc.next();
    int sum = 0;
    char[] C = N.toCharArray();
    for(char c : C) {
      sum += Character.getNumericValue(c);
    }
    String ans = "No";
    if(sum % 9 == 0) ans = "Yes";
    System.out.println(ans);
  }
}
/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