import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        int n = 0;
        for (int i = 0; i < str.length(); i++) {
            n += Integer.parseInt(str.substring(i, i + 1));
        }
        if (n % 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 sc = new Scanner(System.in);
        String str = sc.next();
        int n = 0;
        for (int i = 0; i < str.length(); i++) {
            n += Integer.parseInt(str.substring(i, i + 1));
        }
        if (n % 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 str = sc.next();
        int n = 0;
        for (int i = 0; i < str.length(); i++) {
            n += Integer.parseInt(str.substring(i, i + 1));
        }
        if (n % 9 == 0) {
            System.out.println("Yes");
        }else {
            System.out.println("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        int n = 0;
        for (int i = 0; i < str.length(); i++) {
            n += Integer.parseInt(str.substring(i, i + 1));
        }
        if (n % 9 == 0) {
            System.out.println("Yes");
        }else {
            System.out.println("No");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String str = sc.next(); str sc.next() sc.next sc int n = 0; n 0 for (int i = 0; i < str.length(); i++) {
            n += Integer.parseInt(str.substring(i, i + 1));
        } int i = 0; int i = 0; i 0 i < str.length() i str.length() str.length str i++ i++ i {
            n += Integer.parseInt(str.substring(i, i + 1));
        } {
            n += Integer.parseInt(str.substring(i, i + 1));
        } n += Integer.parseInt(str.substring(i, i + 1)) n Integer.parseInt(str.substring(i, i + 1)) Integer.parseInt Integer str.substring(i, i + 1) str.substring str i i + 1 i 1 if (n % 9 == 0) {
            System.out.println("Yes");
        }else {
            System.out.println("No");
        } n % 9 == 0 n % 9 n 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 str = sc.next();
        int n = 0;
        for (int i = 0; i < str.length(); i++) {
            n += Integer.parseInt(str.substring(i, i + 1));
        }
        if (n % 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 str = sc.next();
        int n = 0;
        for (int i = 0; i < str.length(); i++) {
            n += Integer.parseInt(str.substring(i, i + 1));
        }
        if (n % 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 sc = new Scanner(System.in);
        String str = sc.next();
        int n = 0;
        for (int i = 0; i < str.length(); i++) {
            n += Integer.parseInt(str.substring(i, i + 1));
        }
        if (n % 9 == 0) {
            System.out.println("Yes");
        }else {
            System.out.println("No");
        }
    }
}