#include<stdio.h>
int main()
{
  float n;
  float sum,x;
  do
  {
    scanf("%f",&x);
    sum=0;n=1;
    while(sum<x)
    {
     n++;
     sum+=(1/n);

    }
    printf("%.0f card(s)\n",n-1);
  } while(x!=0.00);
  return 0;

}