public static void Main(string[] args)
Console.WriteLine("Fibonacci Freeze");
Console.Write("Enter a number: ");
input = Console.ReadLine();
if (Double.TryParse(input, out number) == true)
Console.WriteLine("Zero or negative numbers are not allowed.");
Console.WriteLine("Inputs above 50 are not allowed.");
while (counter <= number)
firstNumber = secondNumber;
secondNumber = sequence + firstNumber;
Console.WriteLine("The fibonacci freeze for {0} is {1:#,0}.", number, firstNumber);
Console.WriteLine("Please enter a numeric value.");