#include <stdio.h>

int main()
{
	float c;
	float res;
	int cards;

	while(scanf("%f",&c)!=EOF)
	{
		if(c==0.00)
			break;

		cards=0;
		res=0;
		while((res+=1.0/float(++cards+1))<=c);

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