string s = Console.ReadLine();
            string [] arr= s.Split(' ');
            //返還由' '隔開的字串
            int[] arr1 = new int[9];            
            for (int i = 0; i < arr.Length; i++)
            {
             arr1[i] = Convert.ToInt32(arr[i]);
           //Convert 將一個基本資料型別轉化為另一基本資料型別
 

            }
            for (int i = 0; i < arr1.Length; i++)
            {
                if (arr1[0]<arr1[i])
                {
                    arr1[0] = arr1[i];
                }
            }
            Console.WriteLine("最大值為：{0}",arr1[0]);