> import java.io.*;
> import java.util.*;
> import java.text.DecimalFormat;
> 
> 
> public class Main
> {
>             public static void main(String args[])
>             {
>                     Scanner cin;
>                     double read=0;
>                     double result=0;
>                     DecimalFormat format=new DecimalFormat("#0.##");
>                     
>                        
>                     
>                     for(int count=1;count<=12;count++)
>                     {
>                     	
>                     	cin=new Scanner(System.in);
>                     	
>                     	read=cin.nextDouble();
>                     	result=result+read;
>                     	
>                     }
>                     System.out.print("$"+format.format(result/12));	
>                     	
>                     	
>             }
> }