import java.util.Scanner;
import java.util.Arrays;


public class Main{
    public static void main(String[] args){
        Scanner sc =new Scanner(System.in);
        String n = sc.next();
        int s_length = n.length();
        String tmp2 = "";
        int tmp = 0;
        int sum = 0;
        for(int i=0; i<n.length(); i++){
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        }
        if(sum%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
    }
}
} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays java.util public class Main{
    public static void main(String[] args){
        Scanner sc =new Scanner(System.in);
        String n = sc.next();
        int s_length = n.length();
        String tmp2 = "";
        int tmp = 0;
        int sum = 0;
        for(int i=0; i<n.length(); i++){
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        }
        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 n = sc.next();
        int s_length = n.length();
        String tmp2 = "";
        int tmp = 0;
        int sum = 0;
        for(int i=0; i<n.length(); i++){
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        }
        if(sum%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
    }
} main {
        Scanner sc =new Scanner(System.in);
        String n = sc.next();
        int s_length = n.length();
        String tmp2 = "";
        int tmp = 0;
        int sum = 0;
        for(int i=0; i<n.length(); i++){
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        }
        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 n = sc.next(); n sc.next() sc.next sc int s_length = n.length(); s_length n.length() n.length n String tmp2 = ""; tmp2 "" int tmp = 0; tmp 0 int sum = 0; sum 0 for(int i=0; i<n.length(); i++){
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        } int i=0; int i=0; i 0 i<n.length() i n.length() n.length n i++ i++ i {
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        } {
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        } tmp2=n.substring(i,i+1) tmp2 n.substring(i,i+1) n.substring n i i+1 i 1 tmp=Integer.parseInt(tmp2) tmp Integer.parseInt(tmp2) Integer.parseInt Integer tmp2 sum= sum+tmp sum sum+tmp sum tmp 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);
        String n = sc.next();
        int s_length = n.length();
        String tmp2 = "";
        int tmp = 0;
        int sum = 0;
        for(int i=0; i<n.length(); i++){
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        }
        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 n = sc.next();
        int s_length = n.length();
        String tmp2 = "";
        int tmp = 0;
        int sum = 0;
        for(int i=0; i<n.length(); i++){
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        }
        if(sum%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
    }
}
} Main
import java.util.Scanner;
import java.util.Arrays;


public class Main{
    public static void main(String[] args){
        Scanner sc =new Scanner(System.in);
        String n = sc.next();
        int s_length = n.length();
        String tmp2 = "";
        int tmp = 0;
        int sum = 0;
        for(int i=0; i<n.length(); i++){
            tmp2=n.substring(i,i+1);
            tmp=Integer.parseInt(tmp2);
            sum= sum+tmp;
        }
        if(sum%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
    }
}
}