学步园

#include "iostream"
using namespace std;

int main()
{
	double len, sum;
	int i;
	while (cin >> len && len != 0.00)
	{
		sum = 0;
		for (i = 2; ; i++)
		{
			sum += 1 * 1.0/i;
			if (sum > len)
				break;
		}
		cout << i - 1 << " card(s)" << endl;
	}
}