Poj1004

import java.util.Scanner;public class Main {public static void main(String[] args) {Scanner scan = new Scanner(System.in);double sum = 0,acount;for(int i=0;i<12;i++){acount = scan.nextDouble();if(acount<0){return;}sum = sum+acount;}System.out.println("$"+String.format("%.2f", sum/12));}}