Task 4.1

/**
 * Created by Anatoliy on 07.07.2016.
 * Task 1
 * 4.1
 */
import java.util.Scanner;

public class GallonsToLitres {
    public static void main(String[] args) {
        double gal, lit;
        Scanner in = new Scanner(System.in);
        gal = in.nextDouble();
        lit = gal * 3.78541178;
        System.out.println(lit);
    }
}