import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char n[] = sc.nextLine().toCharArray();
        int sum = 0;
        for(char c: n){
            sum += Character.getNumericValue(c);
        }
        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 sc = new Scanner(System.in);
        char n[] = sc.nextLine().toCharArray();
        int sum = 0;
        for(char c: n){
            sum += Character.getNumericValue(c);
        }
        if(sum % 9 == 0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }    
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char n[] = sc.nextLine().toCharArray();
        int sum = 0;
        for(char c: n){
            sum += Character.getNumericValue(c);
        }
        if(sum % 9 == 0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        char n[] = sc.nextLine().toCharArray();
        int sum = 0;
        for(char c: n){
            sum += Character.getNumericValue(c);
        }
        if(sum % 9 == 0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char n[] = sc.nextLine().toCharArray(); n sc.nextLine().toCharArray() sc.nextLine().toCharArray sc.nextLine() sc.nextLine sc int sum = 0; sum 0 for(char c: n){
            sum += Character.getNumericValue(c);
        } char c n {
            sum += Character.getNumericValue(c);
        } {
            sum += Character.getNumericValue(c);
        } sum += Character.getNumericValue(c) sum Character.getNumericValue(c) Character.getNumericValue Character c 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 sc = new Scanner(System.in);
        char n[] = sc.nextLine().toCharArray();
        int sum = 0;
        for(char c: n){
            sum += Character.getNumericValue(c);
        }
        if(sum % 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);
        char n[] = sc.nextLine().toCharArray();
        int sum = 0;
        for(char c: n){
            sum += Character.getNumericValue(c);
        }
        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 sc = new Scanner(System.in);
        char n[] = sc.nextLine().toCharArray();
        int sum = 0;
        for(char c: n){
            sum += Character.getNumericValue(c);
        }
        if(sum % 9 == 0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }    
}
