import java.util.*;

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