import java.util.*;
class Main{

    public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    String s = sc.nextLine();
    int res =0;
    for(int i=0; i<s.length(); i++) {
    res += (int)(s.charAt(i)-48);
    res = res%9;
    }
    if(res==0)
    System.out.println("Yes");
    else
    System.out.println("No");
     //   System.out.println("Hello World");
    }
}

/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