BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int b = 0;
int c = 0;
while (true) {
int a = Integer.parseInt(reader.readLine());
b+=a;
c++;
if (a==-1)
break; }
double d = b/c;
System.out.println(d);
package com.javarush.task.task05.task0507;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/*
Среднее арифметическое
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int b = 0;
int c = 0;
while (true) {
int a = Integer.parseInt(reader.readLine());
b+=a;
c++;
if (a==-1)
break; }
System.out.println(b/c);
//напишите тут ваш код
}
}