「POJ - 1003」Hangover

import java.util.*;
import java.io.*;

public class Main{
	public static void main(String []args){
		Scanner	cin = new Scanner(new BufferedInputStream(System.in));
		while(cin.hasNext()){
			double f = cin.nextDouble(), ans = 0;
			if(f==0) break;
			int i;
			for(i=2;ans<f;++i)
				ans+=1.0/i;
			System.out.println((i-2) + " card(s)");
		}
	}
}