#include <stdio.h>
#include <math.h>

int main()
{
   double c,sum,n;
   
   scanf ("%lf",&c);

   while (fabs(c) > 0.001) { 
      for (sum = 0,n = 1;sum < c;n++)
         sum += 1 / (n + 1);
      printf ("%d card(s)\n",(int)n-1);
      scanf ("%lf",&c);
   }

   return 0;
}