#include <stdio.h>
void main()
{
  int j;
  float a,i,sum;
  scanf("%.2f",&a);
  while(a!=0.00)
     { sum=0.00;
       for(i=2.00;(sum+=1/i)>a;i++);
       j=i;
       printf("%d card(s)\n",j);
       scanf("%.2f",&a);
      }
 }

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