View Compilation Error

0_0_19927275_27358\Main.java:1: 错误: 非法字符: '#'
#include <cstdio>
^
0_0_19927275_27358\Main.java:1: 错误: 需要class, interface或enum
#include <cstdio>
         ^
0_0_19927275_27358\Main.java:5: 错误: 需要class, interface或enum
int main(){
^
0_0_19927275_27358\Main.java:9: 错误: 需要class, interface或enum
	while (~scanf("%d", &n), n){
	^
0_0_19927275_27358\Main.java:11: 错误: 需要class, interface或enum
		else if (n == 2) printf("%d\n", 5);
		^
0_0_19927275_27358\Main.java:12: 错误: 需要class, interface或enum
		else if (n == 3) printf("%d\n", 15);
		^
0_0_19927275_27358\Main.java:13: 错误: 需要class, interface或enum
		else if (n == 4) printf("%d\n", 20);
		^
0_0_19927275_27358\Main.java:15: 错误: 需要class, interface或enum
		else printf("%d\n", (n - 4) * 10 + 20);
		^
0_0_19927275_27358\Main.java:16: 错误: 需要class, interface或enum
	}
	^
0_0_19927275_27358\Main.java:20: 错误: 需要class, interface或enum
}
^
10 个错误