> #include<iostream>
> using namespace std;
> int main()
> {
>     float c;
>     int i;
>     float a[1000];
>     a[1]=0; 
>     a[2]=0; i=2;
>     while(a[i-1]<=5.20){
>                       a[i]=a[i-1]+1.0/i;
>                       i++;
>     }
>     while(cin>>c && c!=0.00)
>     {
>         i=1;
>         while(c>a[i]){i++;}
>         cout<<i-1<<" card(s)"<<endl;
>     }           
>     return 0;
> }