import java.io.*;
import java.util.*;

public class GallonsToLtrs{
	public static void main (String[] args)throws Exception{
		//1 US gallon = 3.7854118 liters;
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		System.out.print("Enter the Gallon:");
		int gallon = Integer.parseInt(bf.readLine());
		double liters = gallon * 3.7854118;
		System.out.println("Liters: " + liters);
	}
}