import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		double n = sc.nextInt();
		double all = 10000;
		double rate = (all - n) * 0.01 / ((all - n) * 0.01 + n * 0.99) * 100;
		System.out.println(rate);
   }
}