View Compilation Error

0_0_34211205_20769\Main.java:1: 错误: 需要class, interface或enum
	public static void main(String[] args) {
	              ^
0_0_34211205_20769\Main.java:4: 错误: 需要class, interface或enum
		int Sum=0;
		^
0_0_34211205_20769\Main.java:5: 错误: 需要class, interface或enum
		int a=0;
		^
0_0_34211205_20769\Main.java:6: 错误: 需要class, interface或enum
		int b=0;
		^
0_0_34211205_20769\Main.java:7: 错误: 需要class, interface或enum
		int n;
		^
0_0_34211205_20769\Main.java:8: 错误: 需要class, interface或enum
		n=input.nextInt();
		^
0_0_34211205_20769\Main.java:9: 错误: 需要class, interface或enum
		while(n>0)
		^
0_0_34211205_20769\Main.java:12: 错误: 需要class, interface或enum
			 b=input.nextInt();
			 ^
0_0_34211205_20769\Main.java:13: 错误: 需要class, interface或enum
			Sum=a+b;
			^
0_0_34211205_20769\Main.java:15: 错误: 需要class, interface或enum
		System.out.println(Sum);
		^
0_0_34211205_20769\Main.java:16: 错误: 需要class, interface或enum
		n--;
		^
0_0_34211205_20769\Main.java:17: 错误: 需要class, interface或enum
		}
		^
12 个错误