AlgoritmosPaulo.Class3.Main C# (CSharp) Метод

        public static void Main(string[] args)
        {
            int k = 0;
            int n = 0;
            double pi = 0.0;
            Console.WriteLine("Digite o valor de N:");
            n = int.Parse(Console.ReadLine());
            while(k <= n){
            if(k % 2 == 0)
            {
                pi = (pi + 1)/(2*k+1);
            }else
            {
                pi = (pi - 1)/(2*k+1);
            }
            k -= 1;
            }
            pi = 4 * pi;
            Console.WriteLine("O valor de pi e:"+pi);
        }