View Compilation Error

0_0_30502707_30641\Main.java:1: 错误: 需要class, interface或enum
Scanner in = new Scanner(Systen.in);
^
0_0_30502707_30641\Main.java:2: 错误: 需要class, interface或enum
int a;
^
0_0_30502707_30641\Main.java:3: 错误: 需要class, interface或enum
int b;
^
0_0_30502707_30641\Main.java:4: 错误: 需要class, interface或enum
int c;
^
0_0_30502707_30641\Main.java:5: 错误: 需要class, interface或enum
a=in.nextInt();
^
0_0_30502707_30641\Main.java:6: 错误: 需要class, interface或enum
b=in.nextInt();
^
0_0_30502707_30641\Main.java:7: 错误: 需要class, interface或enum
c=a+b;
^
0_0_30502707_30641\Main.java:8: 错误: 需要class, interface或enum
System.out.println(c);
^
8 个错误