#include<stdio.h>
int main()
{
	int i;
	double n,sum;
	while(scanf("%lf",&n)!=EOF&&n)
	{
		sum=0.0;
		for(i=2;i<10000;i++) 
		{
			sum=sum+1.0/i;
			if(sum>n)
			break;
		}
		printf("%d card(s)\n",i-1);
	}
	return 0;
}