> 
> #include <iostream>
> using namespace std;
> int main ()
> {
>     float s,m=0;  int k;
> 	cin>>s;
> 	if(s==0) return 0;
> 	for(k=2;m<s;k++)
> 		m+=1.0/k;
> 	cout<<(k-2)<<" card(s)"<<endl;
> 
> }