import java.util.*;

public class Main {

    public static void main(String args[]) {


        Scanner scan = new Scanner(System.in);

        String s = scan.next();
        long sum = 0;

        for (int i = 0; i<s.length(); i++) {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        }

        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 scan = new Scanner(System.in);

        String s = scan.next();
        long sum = 0;

        for (int i = 0; i<s.length(); i++) {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        }

        if (sum % 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();
        long sum = 0;

        for (int i = 0; i<s.length(); i++) {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        }

        if (sum % 9 == 0) {

            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } main {


        Scanner scan = new Scanner(System.in);

        String s = scan.next();
        long sum = 0;

        for (int i = 0; i<s.length(); i++) {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        }

        if (sum % 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 long sum = 0; sum 0 for (int i = 0; i<s.length(); i++) {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        } int i = 0; int i = 0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        } {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        } int a = Character.getNumericValue(s.charAt(i)); a Character.getNumericValue(s.charAt(i)) Character.getNumericValue Character s.charAt(i) s.charAt s i sum += a sum a 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 scan = new Scanner(System.in);

        String s = scan.next();
        long sum = 0;

        for (int i = 0; i<s.length(); i++) {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        }

        if (sum % 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();
        long sum = 0;

        for (int i = 0; i<s.length(); i++) {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        }

        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 scan = new Scanner(System.in);

        String s = scan.next();
        long sum = 0;

        for (int i = 0; i<s.length(); i++) {
            int a = Character.getNumericValue(s.charAt(i));
            sum += a;
        }

        if (sum % 9 == 0) {

            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}