converter

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int m = Integer.parseInt(sc.nextLine());
        double result = Math.floor(((100 / 1.6) / m) * 4.54);
        System.out.printf("%.0f litres per 100 km", result);

    }
}