#include<iostream>
using namespace std;
int main()
{
	double a[1000];
	double num,total;
	int k=-1,i;
	cin>>num;
	while (num!=0.00)
	{
		double n=1;
		total=1/(n+1);
		while (total<num)
		{
			n=n+1;
			total=total+1/(n+1);
		}
		if (total>=num) 
		{
			k=k+1;
			a[k]=n;
		}
	    cin>>num;
	}
    for(i=0;i<=k;i++)
	cout<<a[i]<<" card(s)"<<endl;
    return 0;
}