> #include <iostream>
> using namespace std;
> 
> int main()
> {
>     double c;
>     while(cin>>c)
>     {
>         if(c<0.01)
>             return 0;
>         else
>         {
>             int n=0;
>             double b=2, sum=0;
>             while(c>sum)
>             {
>                 sum +=1/b;
>                 ++n;
>                 ++b;
>             }
>             cout<<n<<" card(s)"<<endl;
> 
>         }
>     }
>     return 0;
> }