#include <iostream>
using namespace std;
int Cards(int n,double length)
{
	double sum=1.0/(n+1);
	while(sum<length)sum+=(1.0/(++n+1));
	return n;
}
int main()
{
	double length=0;
	while(cin>>length)
	{
		if(length==0.00)break;
		cout<<Cards(1,length)<<" card(s)"<<endl;
	}
	return 0;
}