#include <stdio.h>

int main(int agrc, char *argv[])
{
	float c, s;
	int i;

	while (scanf("%f", &c) == 1)
	{
		if (c == 0.00)
		{
			break;	
		}
		
		s = 0;
		i = 0;
		while (s < c)	
		{
			++i;
			s = s + 1.0/(i+1);	
		}

		printf("%d card(s)\n", i);
	}
	return 0;
}