import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String n = sc.next();
    sc.close();
    int ans = 0;
    for(int i = 0; i < n.length(); i++){
      ans += (n.charAt(i) - '0');
    }
    System.out.println(ans % 9 == 0 ? "Yes" : "No");
  }
} import java.util.Scanner; Scanner java.util public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String n = sc.next();
    sc.close();
    int ans = 0;
    for(int i = 0; i < n.length(); i++){
      ans += (n.charAt(i) - '0');
    }
    System.out.println(ans % 9 == 0 ? "Yes" : "No");
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String n = sc.next();
    sc.close();
    int ans = 0;
    for(int i = 0; i < n.length(); i++){
      ans += (n.charAt(i) - '0');
    }
    System.out.println(ans % 9 == 0 ? "Yes" : "No");
  } main {
    Scanner sc = new Scanner(System.in);
    String n = sc.next();
    sc.close();
    int ans = 0;
    for(int i = 0; i < n.length(); i++){
      ans += (n.charAt(i) - '0');
    }
    System.out.println(ans % 9 == 0 ? "Yes" : "No");
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String n = sc.next(); n sc.next() sc.next sc sc.close() sc.close sc int ans = 0; ans 0 for(int i = 0; i < n.length(); i++){
      ans += (n.charAt(i) - '0');
    } int i = 0; int i = 0; i 0 i < n.length() i n.length() n.length n i++ i++ i {
      ans += (n.charAt(i) - '0');
    } {
      ans += (n.charAt(i) - '0');
    } ans += (n.charAt(i) - '0') ans (n.charAt(i) - '0') n.charAt(i) n.charAt n i '0' System.out.println(ans % 9 == 0 ? "Yes" : "No") System.out.println System.out System System.out ans % 9 == 0 ? "Yes" : "No" ans % 9 == 0 ans % 9 ans 9 0 "Yes" "No" String[] args args public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String n = sc.next();
    sc.close();
    int ans = 0;
    for(int i = 0; i < n.length(); i++){
      ans += (n.charAt(i) - '0');
    }
    System.out.println(ans % 9 == 0 ? "Yes" : "No");
  }
} public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String n = sc.next();
    sc.close();
    int ans = 0;
    for(int i = 0; i < n.length(); i++){
      ans += (n.charAt(i) - '0');
    }
    System.out.println(ans % 9 == 0 ? "Yes" : "No");
  }
} Main
import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String n = sc.next();
    sc.close();
    int ans = 0;
    for(int i = 0; i < n.length(); i++){
      ans += (n.charAt(i) - '0');
    }
    System.out.println(ans % 9 == 0 ? "Yes" : "No");
  }
}