package com.codegym.task.task05.task0507; /* Arithmetic mean */ import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.Scanner; public class Solution { public static void main(String[] args) throws Exception { //BufferedReader bu = new BufferedReader(new InputStreamReader(System.in)); Scanner scan = new Scanner(System.in); int count = 0; double result = 0; int sum = 0; while(true) { int a = scan.nextInt(); if(a == -1) break; if(a != 0) { count++; sum += a; } } result = (double) sum/count; System.out.println(result); } }