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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 count = 0;
int sum = 0;
while(true) {
int number = Integer.parseInt(reader.readLine());
sum = sum + number;
count++;
if(number == -1) {
break;
}
else {
double c = sum / count;
System.out.println(c);
}
}
}
}