using System;

public class Program

{

    public static void Main()

    {   

        int limit = 18;

        int age = 0;

        int max = 60;

        // label

        start:  

        Console.WriteLine("Type you age: ");

        age = Convert.ToInt32(Console.ReadLine());

        // If the age is less than limit (18), age < limit = true

        if (age < limit) {

            Console.WriteLine("The age {0} is invalid!", age);

            // this sentence transfer the control to the 

            // sentences identified by 'start' label

            goto start;

        }

        else if (age > max) {

            Console.WriteLine("The age {0} is greater than {1}!", age, max);

            goto start;

        }

        else {

            // Show the age if this is greater o equal to limit

            Console.WriteLine("The age {0} is valid!", age);

        }

        // Number of males/females

        int males = 0;

        int females = 0;

        // Use switch statement to determine the gender of each record

        readgender:

        Console.WriteLine("Gender (select M for Male or F for female): ");

        // Read the gender

        string gender = Console.ReadLine();

        // Increment values by the value of gender 

        switch (gender.ToUpper()){ //.ToOpper() convert gender to upper case 'm' -> 'M'

            case "M":           

                males++;            // If gender == "M"

                break;

            case "F":

                females++;          // If gender == "F"

                break;

            default:

                goto readgender;    // if gender != "M" and "F"

        }

    }

}