1. 

/**
* @group Lermer Florian, Sayli Hidir, Taskin Umut
* @contact lermer@gmail.de, hidirsayli@hotmail.de taskin_umut@yahoo.de
* @Problem_ID=U10499
* @Link http://icpcres.ecs.baylor.edu/onlinejudge/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&category=16&problem=1440&mosmsg=Submission+received+with+ID+7037112
*
* @status Accepted
* @Version V1.1
*
* @problematical_issues - We misunderstood the Problem at first but
* after we talked with Prof. Gruber and searched
* at the Site http://www.comp.nus.edu.sg/~stevenha/programming/volC4.html#10499%20-%20The%20Land%20of%20Justice
* We found out that the formula is easier than thought
* just look at the solution
*
*/
import java.util.ArrayList;
import java.util.Scanner;

public class Main {

public static void main(String[] args)
{
ArrayList<Integer> al=new ArrayList<Integer>();
Scanner sc=new Scanner(System.in);


while(sc.hasNext())
{
int x=sc.nextInt();
if(x<0) break;
else
if(x>1)System.out.printf("%2.0f%c%n",(((double)x/4)*100),'%');
else System.out.println(0+"%");
}



}

}