Personal Titles

using System;

class Program
{

    static void Main(string[] args)
    {
        double age = double.Parse(Console.ReadLine());
        char gender = char.Parse(Console.ReadLine());
        if(gender=='f')
        {
            if(age>=16)
            {
                Console.WriteLine("Ms.");
            }
            else if(age<16)
            {
                Console.WriteLine("Miss");
            }
        }
        else if(gender=='m')
        {
            if(age>=16)
            {
                Console.WriteLine("Mr.");
            }
            else if(age<16)
            {
                Console.WriteLine("Master");
            }
        }
        else
        {
            Console.WriteLine("Invalid");
        }

    }
}