View Compilation Error

0_0_39272846_30361\Main.java:6: 错误: 需要')'
Scanner input=new Scanner(Scanner(System.in);
                                            ^
0_0_39272846_30361\Main.java:17: 错误: 需要';'
n--
   ^
0_0_39272846_30361\Main.java:20: 错误: 解析时已到达文件结尾
}
 ^
3 个错误