import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        int total = 0;
        //分解して足し算
        for(int i=0; i < n.length(); i++) {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        }
        //判断
        if (total%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 sc = new Scanner(System.in);
        String n = sc.next();
        int total = 0;
        //分解して足し算
        for(int i=0; i < n.length(); i++) {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        }
        //判断
        if (total%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 n = sc.next();
        int total = 0;
        //分解して足し算
        for(int i=0; i < n.length(); i++) {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        }
        //判断
        if (total%9 == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        int total = 0;
        //分解して足し算
        for(int i=0; i < n.length(); i++) {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        }
        //判断
        if (total%9 == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String n = sc.next(); n sc.next() sc.next sc int total = 0; total 0 for(int i=0; i < n.length(); i++) {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        } int i=0; int i=0; i 0 i < n.length() i n.length() n.length n i++ i++ i {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        } {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        } int num = Character.getNumericValue(n.charAt(i)); num Character.getNumericValue(n.charAt(i)) Character.getNumericValue Character n.charAt(i) n.charAt n i total += num total num if (total%9 == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        } total%9 == 0 total%9 total 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 n = sc.next();
        int total = 0;
        //分解して足し算
        for(int i=0; i < n.length(); i++) {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        }
        //判断
        if (total%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 n = sc.next();
        int total = 0;
        //分解して足し算
        for(int i=0; i < n.length(); i++) {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        }
        //判断
        if (total%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 sc = new Scanner(System.in);
        String n = sc.next();
        int total = 0;
        //分解して足し算
        for(int i=0; i < n.length(); i++) {
            int num = Character.getNumericValue(n.charAt(i));
            total += num;
        }
        //判断
        if (total%9 == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}