111
package zh.codegym.task.task05.task0507;
/*
算术平均值
*/
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int count = 1;
int num = 0;
while (true){
num = Integer.parseInt(reader.readLine());
if (num == -1){
break;
}
count++;
num += num;
}
System.out.println(num/count);//在此编写你的代码
}
}