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