package IZPIT;

import java.util.Scanner;

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

        double percentMas = Integer.parseInt(scan.nextLine());
        double percentPro = Integer.parseInt(scan.nextLine());
        double percentCoals = Integer.parseInt(scan.nextLine());
        double totalCalories = Integer.parseInt(scan.nextLine());
        double percentWat =  Integer.parseInt(scan.nextLine());

        double gramMas = (percentMas * totalCalories / 100) /9 ;
        double gramPro = (percentPro * totalCalories / 100) /4;
        double gramCoal = (percentCoals * totalCalories / 100) /4 ;

        double gram = gramCoal + gramMas + gramPro;
        double calPerGram = totalCalories / gram;
        double calories = calPerGram - (percentWat / 100 * calPerGram);


        System.out.printf("%.4f",calories);

    }

}