using System;

public class Program

{

    public static void Main()

    {

        int sum = 1;

        int []a = new int [5];

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

        {a[i] = int.Parse(Console.ReadLine());}

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

        {sum = sum*a[i];}

        double av=sum;

        Console.WriteLine(av);   

        }

    }

​