#include <iostream>
#include <vector>


static std::vector<double> max_lengths;

static void init() {
    double length = 0;
    for (int i = 2; length < 5.5; i++) {
        max_lengths.push_back(length);
        length += 1.0 / i;
    }
}


int main() {
    init();
    double target_length = 0;
    for (;;) {
        std::cin >> target_length;
        if (target_length == 0) { break; }
        for (int i = 0;; i++) {
            if (max_lengths[i] > target_length) {
                std::cout << i << " card(s)" << std::endl;
                break;
            }
        }
    }
    return 0;
}