View Compilation Error

0_0_39251445_6739\Main.java:1: 错误: 需要class, interface或enum
 public static void main(String[] args) {
               ^
0_0_39251445_6739\Main.java:3: 错误: 需要class, interface或enum
        while (in.hasNext()){
        ^
0_0_39251445_6739\Main.java:5: 错误: 需要class, interface或enum
            int m=in.nextInt()-1;
            ^
0_0_39251445_6739\Main.java:6: 错误: 需要class, interface或enum
            double sum=n;
            ^
0_0_39251445_6739\Main.java:7: 错误: 需要class, interface或enum
            while(m!=0){
            ^
0_0_39251445_6739\Main.java:9: 错误: 需要class, interface或enum
                n=Math.sqrt(n);
                ^
0_0_39251445_6739\Main.java:10: 错误: 需要class, interface或enum
                m--;
                ^
0_0_39251445_6739\Main.java:11: 错误: 需要class, interface或enum
            }
            ^
8 个错误