poj 1003 Java

import java.util.Scanner;

class Main{
public static void main(String[] args){
Scanner in=new Scanner(System.in);
while(in.hasNext()){
double f=in.nextFloat();
if(f==0)
return ;
if(f<=0.5){
System.out.println("1 card(s)");
continue;
}
int ans=1;
double sum=0.5;
int base=2;
do{
base++;
ans++;
sum+=1.0/base;
}while(sum<f);
System.out.println(ans+" card(s)");
}
}
}