Write a C# Sharp program which takes a positive number and return the nth odd number

using System;
using System.Linq;
namespace exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("1st odd number: "+test(1));
            Console.WriteLine("2nd odd number: " + test(2));
            Console.WriteLine("4th odd number: " + test(4));
            Console.WriteLine("100th odd number: " + test(100));
        }
        public static int test(int n)
        {
            return n * 2 - 1;
        }
    }
}