[ALGORISM]poj 1003

// 2011 07 03
// poj 1003
//daun

#include <iostream>
#include <math.h>

using namespace std;

int main()
{
 double sum = 0;

 double length = 0;
 cin >> length;

 while(length != 0)
 {
  sum = 0;
  for(int a = 2 ; ; a++)
  {
   sum += (1/(double)a);

   if(length-sum <0)
   {
    cout << a-1 <<" card(s)"<<endl;
    break;
   }
  }

  cin >> length;
 }
 return 0;
}