using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter pipeline length in m");

        double L = double.Parse(Console.ReadLine());

        Console.WriteLine("Enter pipeline internal diameter in mm");

        double D = double.Parse(Console.ReadLine());

        Console.WriteLine("Enter pipeline roughness in mm");

        double e = double.Parse(Console.ReadLine());    

        Console.WriteLine("Enter pipeline flow rate in L/s");

        double Q = double.Parse(Console.ReadLine());

        Console.WriteLine("Enter pipeline minor loss coeff.");

        double K = double.Parse(Console.ReadLine());

        Console.WriteLine("Enter fluid kniematic viscosity in N/m2");

        double v = double.Parse(Console.ReadLine());

        //Console.WriteLine(v);

        double V = Q/1000*4 / Math.PI/Math.Pow(D/1000,2);

        double Re = D/1000*V/v;

        double MinorLoss= K*Math.Pow(V,2)/2/9.81;

        double F=0.25/Math.Pow(Math.Log10(e/3.7/D+5.74/Math.Pow(Re,0.9)),2);

        double Pipeloss= F*L/D*1000*Math.Pow(V,2)/2/9.81;

        double Headloss= MinorLoss+Pipeloss;

        Console.WriteLine("Headloss = {0:F2} m", Headloss);

        Console.WriteLine("Gradient = {0:F5}", Headloss/L);

        //Console.WriteLine(" {0} {1} {2} {3} ", Re,MinorLoss,F,Pipeloss);

    }

}