static void Main(string[] args)
{
Animal animal = new Animal();
Duck duck = new Duck();
duck.nNumbOfLegs = 2;
BigInteger a = 1;
BigInteger b = 1;
BigInteger answer = 0;
for(BigInteger x = 0; x<40000; x++)
{
BigInteger y = Fib(a,b);
b = a;
a = y;
answer += y;
}
Console.WriteLine(answer);
Console.Write(duck.nNumbOfLegs); //outputs the number of legs my duck has
Console.Read(); //waits for input to keep the console up until keep pressed
}