View Compilation Error

0_0_14773522_26571\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_14773522_26571\Main.java:4: 错误: 需要class, interface或enum
		int n = in.nextInt();
		^
0_0_14773522_26571\Main.java:5: 错误: 需要class, interface或enum
		for(int i=1;i<=n;i++){
		^
0_0_14773522_26571\Main.java:5: 错误: 需要class, interface或enum
		for(int i=1;i<=n;i++){
		            ^
0_0_14773522_26571\Main.java:5: 错误: 需要class, interface或enum
		for(int i=1;i<=n;i++){
		                 ^
0_0_14773522_26571\Main.java:7: 错误: 需要class, interface或enum
			BigInteger b = in.nextBigInteger();
			^
0_0_14773522_26571\Main.java:8: 错误: 需要class, interface或enum
			System.out.println(a.add(b).toString());
			^
0_0_14773522_26571\Main.java:9: 错误: 需要class, interface或enum
		}
		^
8 个错误