import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String line = sc.nextLine();
    String data[] = line.split("");
    int sum = 0;
    for(int i = 0;i < data.length;i++){
      int num = Integer.parseInt(data[i]);
      sum += num;
    }
    if(sum % 9 == 0){
      System.out.println("Yes");
    }
    else{
      System.out.println("No");
    }
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String line = sc.nextLine();
    String data[] = line.split("");
    int sum = 0;
    for(int i = 0;i < data.length;i++){
      int num = Integer.parseInt(data[i]);
      sum += num;
    }
    if(sum % 9 == 0){
      System.out.println("Yes");
    }
    else{
      System.out.println("No");
    }
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String line = sc.nextLine();
    String data[] = line.split("");
    int sum = 0;
    for(int i = 0;i < data.length;i++){
      int num = Integer.parseInt(data[i]);
      sum += num;
    }
    if(sum % 9 == 0){
      System.out.println("Yes");
    }
    else{
      System.out.println("No");
    }
  } main {
    Scanner sc = new Scanner(System.in);
    String line = sc.nextLine();
    String data[] = line.split("");
    int sum = 0;
    for(int i = 0;i < data.length;i++){
      int num = Integer.parseInt(data[i]);
      sum += num;
    }
    if(sum % 9 == 0){
      System.out.println("Yes");
    }
    else{
      System.out.println("No");
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String line = sc.nextLine(); line sc.nextLine() sc.nextLine sc String data[] = line.split(""); data line.split("") line.split line "" int sum = 0; sum 0 for(int i = 0;i < data.length;i++){
      int num = Integer.parseInt(data[i]);
      sum += num;
    } int i = 0; int i = 0; i 0 i < data.length i data.length data data.length i++ i++ i {
      int num = Integer.parseInt(data[i]);
      sum += num;
    } {
      int num = Integer.parseInt(data[i]);
      sum += num;
    } int num = Integer.parseInt(data[i]); num Integer.parseInt(data[i]) Integer.parseInt Integer data[i] data i sum += num sum num if(sum % 9 == 0){
      System.out.println("Yes");
    }
    else{
      System.out.println("No");
    } sum % 9 == 0 sum % 9 sum 9 0 {
      System.out.println("Yes");
    } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
      System.out.println("No");
    } System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String line = sc.nextLine();
    String data[] = line.split("");
    int sum = 0;
    for(int i = 0;i < data.length;i++){
      int num = Integer.parseInt(data[i]);
      sum += num;
    }
    if(sum % 9 == 0){
      System.out.println("Yes");
    }
    else{
      System.out.println("No");
    }
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String line = sc.nextLine();
    String data[] = line.split("");
    int sum = 0;
    for(int i = 0;i < data.length;i++){
      int num = Integer.parseInt(data[i]);
      sum += num;
    }
    if(sum % 9 == 0){
      System.out.println("Yes");
    }
    else{
      System.out.println("No");
    }
  }
} Main
import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String line = sc.nextLine();
    String data[] = line.split("");
    int sum = 0;
    for(int i = 0;i < data.length;i++){
      int num = Integer.parseInt(data[i]);
      sum += num;
    }
    if(sum % 9 == 0){
      System.out.println("Yes");
    }
    else{
      System.out.println("No");
    }
  }
}