static void Main(string[] args)
{
    // Initial values
    double h = 50, v = 8, mF = 35;

    // Preparation
    bool malfunction = false;

    // Repeating individual landing steps
    while (h >= 0)
    {
        // Displaying current values
        string height   = "Height: " + h.ToString("N1");
        string velocity = "Velocity: " + v.ToString("N1");
        string fuel     = "Fuel: " + mF.ToString("N1");
        Console.WriteLine(height + "  " + velocity + "  " + fuel);

        // Input
        Console.Write("Enter percentage of breaking (0-100): ");
        string input = Console.ReadLine();
        double percents = 0;
        try
        {
            percents = Convert.ToDouble(input);
            if (percents < 0 || percents > 100)
            {
                malfunction = true;
            }
        }
        catch (Exception)
        {
            malfunction = true;
        }

        if (malfunction)
        {
        percents = 0;
            Console.WriteLine("CONTROL MALFUNCTION!");
        }
        
        // Fuel check
        if (mF <= 0)
        {
        percents = 0;
            Console.WriteLine("NO FUEL!");
        }
        // Calculating new values
        double F = 360 * percents;
        double a = 1.62 - F / 8000;
        h -= v + a / 2;
        v += a;
        mF -= F / 3000;
        if (mF <= 0)
        {
        mF = 0; }
        // Output of an empty line
        Console.WriteLine();
    }
    
    // End of a single landing step
    // Output
    Console.WriteLine("Landing velocity: " + v.ToString("N1"));

    string evaluation = v < 4 ?
        "Soft landing, congratulations!" :
        (v <= 8 ? "Hard landing." : "Houston, crew is lost...");

    Console.WriteLine(evaluation);
    // Waiting for Enter
    Console.ReadLine();
}

static void Main(string[] args)
{
    // Initial values
    double h = 50, v = 8, mF = 35;

    // Preparation
    bool malfunction = false;

    // Repeating individual landing steps
    while (h >= 0)
    {
        // Displaying current values
        string height   = "Height: " + h.ToString("N1");
        string velocity = "Velocity: " + v.ToString("N1");
        string fuel     = "Fuel: " + mF.ToString("N1");
        Console.WriteLine(height + "  " + velocity + "  " + fuel);

        // Input
        Console.Write("Enter percentage of breaking (0-100): ");
        string input = Console.ReadLine();
        double percents = 0;
        try
        {
            percents = Convert.ToDouble(input);
            if (percents < 0 || percents > 100)
            {
                malfunction = true;
            }
        }
        catch (Exception)
        {
            malfunction = true;
        }

        if (malfunction)
        {
        percents = 0;
            Console.WriteLine("CONTROL MALFUNCTION!");
        }
        
        // Fuel check
        if (mF <= 0)
        {
        percents = 0;
            Console.WriteLine("NO FUEL!");
        }
        // Calculating new values
        double F = 360 * percents;
        double a = 1.62 - F / 8000;
        h -= v + a / 2;
        v += a;
        mF -= F / 3000;
        if (mF <= 0)
        {
        mF = 0; }
        // Output of an empty line
        Console.WriteLine();
    }
    
    // End of a single landing step
    // Output
    Console.WriteLine("Landing velocity: " + v.ToString("N1"));

    string evaluation = v < 4 ?
        "Soft landing, congratulations!" :
        (v <= 8 ? "Hard landing." : "Houston, crew is lost...");

    Console.WriteLine(evaluation);
    // Waiting for Enter
    Console.ReadLine();
}