Хелп!
package com.javarush.task.task05.task0507;
import java.io.*;
public class Solution {
public static double c = 0;
public static void main(String[] args) throws Exception {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
int n = 0;
while (true){
double i = Integer.parseInt(bufferedReader.readLine());
if (i == -1)
break;
c+=i;
n+=1;
}
System.out.println(c/n);
}
}