package vegemarket;

import java.util.Scanner;

public class vege {

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

			 double VegetablePrice = Double.parseDouble(scanner.nextLine());
			 double FruitPrice = Double.parseDouble(scanner.nextLine());
			 int VegetablePerKg = scanner.nextInt();
			 int FruitPerKg = scanner.nextInt();

		    double vegetableTotal = VegetablePrice * VegetablePerKg;
			double fruitTotal = FruitPrice * FruitPerKg;

			System.out.println("Total = " + (vegetableTotal + fruitTotal) / 1.94);
		 }



}