import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        int l = str.length();
        String[] array = str.split("");
        int ans = 0;

        for (int i = 0; i < l; i++) {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        }
        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 sc = new Scanner(System.in);
        String str = sc.nextLine();
        int l = str.length();
        String[] array = str.split("");
        int ans = 0;

        for (int i = 0; i < l; i++) {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        }
        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 str = sc.nextLine();
        int l = str.length();
        String[] array = str.split("");
        int ans = 0;

        for (int i = 0; i < l; i++) {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        }
        if (ans % 9 == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    } main {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        int l = str.length();
        String[] array = str.split("");
        int ans = 0;

        for (int i = 0; i < l; i++) {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        }
        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 str = sc.nextLine(); str sc.nextLine() sc.nextLine sc int l = str.length(); l str.length() str.length str String[] array = str.split(""); array str.split("") str.split str "" int ans = 0; ans 0 for (int i = 0; i < l; i++) {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        } int i = 0; int i = 0; i 0 i < l i l i++ i++ i {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        } {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        } int tmp = Integer.parseInt(array[i]); tmp Integer.parseInt(array[i]) Integer.parseInt Integer array[i] array i ans += tmp ans tmp 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 sc = new Scanner(System.in);
        String str = sc.nextLine();
        int l = str.length();
        String[] array = str.split("");
        int ans = 0;

        for (int i = 0; i < l; i++) {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        }
        if (ans % 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.nextLine();
        int l = str.length();
        String[] array = str.split("");
        int ans = 0;

        for (int i = 0; i < l; i++) {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        }
        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 sc = new Scanner(System.in);
        String str = sc.nextLine();
        int l = str.length();
        String[] array = str.split("");
        int ans = 0;

        for (int i = 0; i < l; i++) {
            int tmp = Integer.parseInt(array[i]);
            ans += tmp;
        }
        if (ans % 9 == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    }
}