package poj.ProblemSet;

 import java.util.Scanner;

 public class poj1003 {

     public static void main(String[] args) {

         Scanner cin = new Scanner(System.in);

         for (double a=cin.nextDouble();!(Math.abs(a - 0.00) < 0.001);a = cin.nextDouble()){

             double sum = 0.0;

             int ans = 0;

             for (int i = 2; ; i++) {

                 sum += (double) 1 / i;

                 if (sum >= a) {

                     ans = i - 1;

                     break;

                 }

             }

             System.out.println(ans + " card(s)");

         }

     }

 }