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using System;
using System.Numerics;
 
public class Test
{
	public static void Main()
	{
		var fibs = new Fibonacci();
		for (var i = 0; i < 20; i++)
		{
			Console.WriteLine(fibs.Calculate(i));
		}
 
		Console.WriteLine(fibs.Calculate(10000));
		Console.WriteLine(fibs.Calculate(20000));
	}
}
 
internal class Fibonacci
{
	private readonly List<BigInteger> fibs = new List<BigInteger>
	{
		BigInteger.Zero,
		BigInteger.One
	};
 
	public BigInteger Calculate(int ordinalPosition)
	{
		if (ordinalPosition < 0)
		{
			throw new ArgumentOutOfRangeException("ordinalPosition", "ordinalPosition is less than zero.");
		}
 
		for (var i = this.fibs.Count; i <= ordinalPosition; i++)
		{
			this.fibs.Add(BigInteger.Add(this.fibs[i - 1], this.fibs[i - 2]));
		}
 
		return this.fibs[ordinalPosition];
	}
}

prog.cs(2,14): error CS0234: The type or namespace name `Numerics' does not exist in the namespace `System'. Are you missing an assembly reference?
prog.cs(27,16): error CS0246: The type or namespace name `BigInteger' could not be found. Are you missing a using directive or an assembly reference?
Compilation failed: 2 error(s), 0 warnings

Standard output is empty