import java.util.*;

public class Main{
  public static void main(String[] args)
  {
    Scanner sc=new Scanner(System.in);
    String s=sc.nextLine();
    long sum=0;
    for(int i=0;i<s.length();i++)
    {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    }
    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 s=sc.nextLine();
    long sum=0;
    for(int i=0;i<s.length();i++)
    {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    }
    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 s=sc.nextLine();
    long sum=0;
    for(int i=0;i<s.length();i++)
    {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    }
    if(sum%9==0)
    System.out.println("Yes");
    else
    System.out.println("No");
  } main {
    Scanner sc=new Scanner(System.in);
    String s=sc.nextLine();
    long sum=0;
    for(int i=0;i<s.length();i++)
    {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    }
    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 s=sc.nextLine(); s sc.nextLine() sc.nextLine sc long sum=0; sum 0 for(int i=0;i<s.length();i++)
    {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    } int i=0; int i=0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    } {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    } sum+=Long.parseLong(String.valueOf(s.charAt(i))) sum Long.parseLong(String.valueOf(s.charAt(i))) Long.parseLong Long String.valueOf(s.charAt(i)) String.valueOf String s.charAt(i) s.charAt s i 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 s=sc.nextLine();
    long sum=0;
    for(int i=0;i<s.length();i++)
    {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    }
    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 s=sc.nextLine();
    long sum=0;
    for(int i=0;i<s.length();i++)
    {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    }
    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 s=sc.nextLine();
    long sum=0;
    for(int i=0;i<s.length();i++)
    {
      sum+=Long.parseLong(String.valueOf(s.charAt(i)));
    }
    if(sum%9==0)
    System.out.println("Yes");
    else
    System.out.println("No");
  }
}