import java.util.Scanner;

 public class HDU1877 {

     public static void main(String[] args) {

         // TODO Auto-generated method stub

             Scanner input = new Scanner(System.in);

             for(;;){

                 int jinzhi = input.nextInt();

                 if(jinzhi==0){

                     break;

                 }else{

                     int a = input.nextInt();

                     int b = input.nextInt();

                     int c = a+b;

                     int i = 0;

                     int k = 0;

                     int s = 0;

                     while(c!=0){

                         k = c%jinzhi;

                         s+=k*(int)Math.pow(10, i);

                         i++;

                         c=c/jinzhi;

                     }

                     System.out.println(s);

                 }

             }

     }

 }