using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the time it took from the jump to landing (T): ");

        // Type a single "?" at the end of the input to get more output.

        bool debugMode = false;

        String inputS = Console.ReadLine();

        if (inputS.Contains("?")) {

            debugMode = true;

            inputS = inputS.Substring(0, inputS.Length - 1);

        }

        float totalTime = float.Parse(inputS);

        float gravity = -9.81f; // This can be changed in a mars basketball scenario

        float maxTime = totalTime / 2; // The time where the player reached their maximum height

        float initVelocity = - gravity * maxTime; // The initial velocity WAS solved by v0 = -aT^2 / 2T: it now uses v0 = -aT

        float maxHeight = maxTime * (initVelocity + gravity * maxTime / 2); // Just use the equation plugging in v0 and maxT

        Console.WriteLine("The maximum height reached was " + maxHeight + " meters.");

        if (debugMode) {

            Console.WriteLine("The initial velocity of the jump was " + initVelocity + " meters per second.");

            Console.WriteLine("The time of the peak of the jump was " + maxTime + " seconds in.");

            // Below is always zero, but no real reason not to include it ;)

            Console.WriteLine("The velocity at the peak of the jump was " + (initVelocity + maxTime * gravity) + " meters per second.");

        }

    }

}