#include<iostream>
using namespace std;

int main()
{
	double len, total;
	while(1)
	{
		cin >> len;
		if (len == 0.00)
			break;

		total = 0;
		
		for (int j = 1; total < len; j ++)
			total += 1.0000 / (j + 1); 

		cout << j -1 << " card(s)"  << endl;
	}

}