package java1;

import java.util.Scanner;

public class Klian001 {

	public static void main(String[] args) {
		Scanner qi = new Scanner(System.in);
		System.out.println("ʣ");
		double g = qi.nextInt();
		double fang, wu;
		fang = g * 0.4;
		wu = g * 0.25;
		g = fang + wu + g;
		System.out.println("ʣ" + g);

	}

}