View Compilation Error

0_0_39351388_573\Main.java:2: 错误: 需要class, interface或enum
public Class Main{
       ^
0_0_39351388_573\Main.java:3: 错误: 需要class, interface或enum
 public static void main(String[] args) {
               ^
0_0_39351388_573\Main.java:5: 错误: 需要class, interface或enum
            boolean flag= true;
            ^
0_0_39351388_573\Main.java:6: 错误: 需要class, interface或enum
            while (scanner.hasNextInt()) {
            ^
0_0_39351388_573\Main.java:8: 错误: 需要class, interface或enum
                int sum = n *(n + 1) / 2;
                ^
0_0_39351388_573\Main.java:9: 错误: 需要class, interface或enum
                if (flag){
                ^
0_0_39351388_573\Main.java:11: 错误: 需要class, interface或enum
                }else {
                ^
0_0_39351388_573\Main.java:13: 错误: 需要class, interface或enum
                }
                ^
0_0_39351388_573\Main.java:17: 错误: 需要class, interface或enum
            }
            ^
9 个错误