> #include <iostream>
> using namespace std;
> int main()
> {
> 	int n;
> 	float c,sum=0.00;
> 	cin>>c;
> 	while(c!=0.00)
> 	{
> 		for(n=1;sum<=c;n++)
> 		{
> 			sum+=1.0/(n+1);
> 		}
> 		cout<<n-1<<" card(s)"<<endl;
> 		cin>>c;
> 		sum=0;
> 	}
> 	return 0;
> }