import java.util.*;

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