Sum of previous twos

//0,1,1,2,3,5,8

//output

//====================

            List<int> lstNum = new List<int>();

            int n = 7;

            for (int i = 0, j = 0; i < n; i++, j++)

            {

                if (i < 2)

                {

                    lstNum.Add(i);

                }

                else

                {

                    int x = lstNum[i - 2];

                    int y = lstNum[i - 1];

                    lstNum.Add(x + y);

                }

            }

            foreach (int j in lstNum)

            {

                Console.Write(j.ToString() + ",");

            }

            Console.ReadLine();

//================================