#include<stdio.h>
#include<stdlib.h>
int main()
{
	float s,n,t;
	scanf("%f",&s);
	while(s!=0)
	{
		t=0;
		n=2;
		while(t<s)
		{
			t+=1/n;
			n++;
		}
		printf("%d card(s)\n",(int)(n-2));
		scanf("%f",&s);
	}
	return 0;	
}