import java.util.*;
public class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        String num = sc.nextLine();
        int sum=0;
        for(int i=0;i<num.length();i++){
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        }
        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);
        String num = sc.nextLine();
        int sum=0;
        for(int i=0;i<num.length();i++){
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        }
        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);
        String num = sc.nextLine();
        int sum=0;
        for(int i=0;i<num.length();i++){
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    } main {
        Scanner sc = new Scanner(System.in);
        String num = sc.nextLine();
        int sum=0;
        for(int i=0;i<num.length();i++){
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String num = sc.nextLine(); num sc.nextLine() sc.nextLine sc int sum=0; sum 0 for(int i=0;i<num.length();i++){
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        } int i=0; int i=0; i 0 i<num.length() i num.length() num.length num i++ i++ i {
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        } {
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        } int x =Character.getNumericValue(num.charAt(i)); x Character.getNumericValue(num.charAt(i)) Character.getNumericValue Character num.charAt(i) num.charAt num i sum+=x sum x 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 System.out System System.out "Yes" 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 num = sc.nextLine();
        int sum=0;
        for(int i=0;i<num.length();i++){
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        }
        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);
        String num = sc.nextLine();
        int sum=0;
        for(int i=0;i<num.length();i++){
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        }
        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);
        String num = sc.nextLine();
        int sum=0;
        for(int i=0;i<num.length();i++){
            int x =Character.getNumericValue(num.charAt(i));
            sum+=x;
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
}