> import java.util.Scanner;
> public class Main {
> 
> 	/**
> 	 * @param args
> 	 */
> 	public static void main(String[] args) {
> 		// TODO Auto-generated method stub
> 		Scanner sc = new Scanner(System.in);
> 		double input, output;
> 		int n;
> 		while((input=sc.nextDouble())!=0){
> 			n=1;
> 			output=0.5;
> 			while(input>output){
> 				n++;
> 				output+=1.0/(n+1);
> 			}
> 			System.out.println(n+" cards(s)");
> 		}
> 	}
> 
> }