using System;

public class Program

{

    public static void Main()

    {

        const int lowerLimit = 20;

        const int upperLimit = 55;

        int[] test = new int[] {-10, 0, 15, 19, 20, 21, 25, 40, 55, 56, 90};

        // Run through a set of test numbers

        foreach (int i in test)

        {

            // Note that C# does not allow modification of i (the loop variable)

            // Let's assign the test number to a variable and modify it as needed.

            int speed = i;

            if (speed < lowerLimit) speed = lowerLimit;

            else if (speed > upperLimit) speed = upperLimit;

            Console.WriteLine("Speed: {0,4:N0} -> {1,3:N0}", i, speed);

        }

    }

}