例题：100节楼梯，0-49节，分数等于节数。50节（包括50节）以后每节10分。输入节数，得出分数。这个题如果按照讲页来做是错误的，所以再写一遍，请大家指导

 while (true)

            {

                Console.Write("请输入你的楼梯数：");

                int n = Convert.ToInt32(Console.ReadLine());

                int fenshu = 0;

                if (n > 100)

                {

                    Console.WriteLine("您输入的楼梯数有误！");

                                    }

                else

                {

                    for (int i = 1; i <= n; i++)   //根据输入的楼梯数来循环

                    {

                        if (n< 50)         //加条件，在50节楼梯以下怎么计算得分

                             {

                            fenshu =  n;

                        }

                        else

                        {

                            //fenshu = 49 + (n - 49) * 10;

                            fenshu = n * 10;

                        }  

                   }

                    Console.WriteLine("爬" + n + "个楼梯,您的得分是" + fenshu);

                 }