package cn.g;

import java.util.Scanner;

public class Main{

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		while(true){
		Scanner cin=new Scanner(System.in);
        double end=cin.nextDouble(),sum=0;
        int cardNums=1;
        	if(end==0.00||end<0.01 ||end>5.20) break;
        	for(;sum<end;cardNums++){
        		 sum+=1.0/(cardNums+1);
        	}
        	System.out.println((cardNums-1)+" card(s)");
        }
	}

}