北大 acm 1003 Hangover java版

import java.util.Scanner;
/**
* 3196K 172MS Java 413B
* @author Administrator
*
*/
public class Main {

public static void main(String[] args) {
Scanner sin = new Scanner(System.in) ;
float d  ;
while(sin.hasNextFloat()){
int i = 1 ;
float sum = 0.00f ;
d =sin.nextFloat() ;
if(d==0.00){
System.exit(1) ;
}else{
while(d>sum) {
i++ ;
sum += (float)1/i ;
}
System.out.println(i-1+" card(s)") ;
}
}
}
}