using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tile_repair
{
    class Program
    {
        static void Main(string[] args)
        {
            int i = int.Parse(Console.ReadLine()); // strana ploshtadka    
            double a = double.Parse(Console.ReadLine()); //shirina plochki
            double b = double.Parse(Console.ReadLine()); //duljina plochki
            int c = int.Parse(Console.ReadLine()); //shirina peika         
            int x = int.Parse(Console.ReadLine()); //duljina peika        


            double ploshtadka = i * i;
            double ploshtpeika = c * x;
            double ploshtzapokrivane = ploshtadka - ploshtpeika;
            double ploshtplochki = a * b;
            //double plochki = (ploshtadka / ploshtplochki);                
            double plochki = ploshtzapokrivane / ploshtplochki;
            double vreme = plochki * 0.2;
			Console.WriteLine("{0:f2} ", +plochki);
			//Console.WriteLine("Plochki = {0} ", +plochki);                 
			//Console.WriteLine("Vreme za slagane = {0} ", vreme);           
			Console.WriteLine("{0:f2} ", vreme);
			
        }
    }
}