import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final int all_people = 1000000;
		
		final int N = sc.nextInt();
		
		final int mafia_people = (all_people / 10000) * N;
		final int normal_people = all_people - mafia_people;
		
		final double judge_mafia_in_mafia = mafia_people * 0.99;
		final double judge_mafia_in_normal = normal_people * 0.01;
		
		final double judge_mafia = judge_mafia_in_mafia + judge_mafia_in_normal;
		
		System.out.printf("%.8f\n", judge_mafia_in_normal / judge_mafia * 100);
		
		
		
	}
	
}