#include <iostream>
using namespace std;

int main()
{
    float f;
    while (cin>>f&&f!=0.00)
    {
        int count = 0;
        float fsum = 0.00f;
        while (fsum<f&&++count)
            fsum += 1.0/(count+1);
        cout<<count<<" card(s)"<<endl;
    }

    return 0;
}