import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    int ans = 0;
    for (int i = S.length(); i > 0 ; i--){
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    }
    if (ans % 9 == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
} import java.util.Scanner; Scanner java.util public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    int ans = 0;
    for (int i = S.length(); i > 0 ; i--){
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    }
    if (ans % 9 == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
} Main public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    int ans = 0;
    for (int i = S.length(); i > 0 ; i--){
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    }
    if (ans % 9 == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  } main {
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    int ans = 0;
    for (int i = S.length(); i > 0 ; i--){
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    }
    if (ans % 9 == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String S = scan.next(); S scan.next() scan.next scan int ans = 0; ans 0 for (int i = S.length(); i > 0 ; i--){
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    } int i = S.length(); int i = S.length(); i S.length() S.length S i > 0 i 0 i-- i-- i {
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    } {
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    } ans = ans + Integer.parseInt(S.substring(i-1,i)) ans ans + Integer.parseInt(S.substring(i-1,i)) ans Integer.parseInt(S.substring(i-1,i)) Integer.parseInt Integer S.substring(i-1,i) S.substring S i-1 i 1 i if (ans % 9 == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    } ans % 9 == 0 ans % 9 ans 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 scan = new Scanner(System.in);
    String S = scan.next();
    int ans = 0;
    for (int i = S.length(); i > 0 ; i--){
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    }
    if (ans % 9 == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
} public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    int ans = 0;
    for (int i = S.length(); i > 0 ; i--){
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    }
    if (ans % 9 == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
} Main
import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String S = scan.next();
    int ans = 0;
    for (int i = S.length(); i > 0 ; i--){
      ans = ans + Integer.parseInt(S.substring(i-1,i));
    }
    if (ans % 9 == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
}
