import java.util.Scanner;
class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);

    String s = sc.next();

    int ans = 0;
    for(int i = s.length(); i > 0; i--) {
      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 class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);

    String s = sc.next();

    int ans = 0;
    for(int i = s.length(); i > 0; i--) {
      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 sc = new Scanner(System.in);

    String s = sc.next();

    int ans = 0;
    for(int i = s.length(); i > 0; i--) {
      ans += Integer.parseInt(s.substring(i-1, i));
    }

    if(ans%9 == 0) {
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  } main {
    Scanner sc = new Scanner(System.in);

    String s = sc.next();

    int ans = 0;
    for(int i = s.length(); i > 0; i--) {
      ans += Integer.parseInt(s.substring(i-1, i));
    }

    if(ans%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.next(); s sc.next() sc.next sc int ans = 0; ans 0 for(int i = s.length(); i > 0; i--) {
      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 += Integer.parseInt(s.substring(i-1, i));
    } {
      ans += Integer.parseInt(s.substring(i-1, i));
    } 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
import java.util.Scanner;
class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);

    String s = sc.next();

    int ans = 0;
    for(int i = s.length(); i > 0; i--) {
      ans += Integer.parseInt(s.substring(i-1, i));
    }

    if(ans%9 == 0) {
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
}
