using System;

public class Program

{

    public static void Main()

    {

        int turi = 0;

        double resist12 = 0;

        double resist45 = 0;

        double resist123 = 0;

        double resist345 = 0;

        double RT = 0;

        double RT2 = 0;

        int[] resist = new int[5];

        for (int i=0; i<5; i++)

        {

Console.WriteLine("input resistence");

            resist[i] = int.Parse(Console.ReadLine());

            turi += resist[i];

        }

        Console.WriteLine(" resistence in turi : {0}",turi);

        resist45 = (double)resist[3]*resist[4]/(resist[3]+resist[4]);

            resist123 = (double)(resist[0]*resist[1]/(resist[0]+resist[1]))*resist[2]/((resist[0]*resist[1]/(resist[0]+resist[1]))+resist[2]);

            RT = (double)resist45*resist123/(resist45+resist123);

            Console.WriteLine(" resistence in makbili : {0}",RT);

                resist12 = (double)resist[0]+resist[1];

        resist345 = (double)resist45*resist[2]/(resist[2]+resist45);

        RT2 =  (double) resist12+resist345;

        Console.WriteLine(" Total resistence is : {0}",RT2);

    }

}