//Rosa Enciso
// Solution to 2007 BHCSI Mock Contest #1 Problem Shopping Addict

import java.io.*;
import java.util.*;
import java.lang.*;

public class shop
{

	public static void main (String [] args) throws IOException
	{
		Scanner input = new Scanner(new File("shop.in"));
		int n = input.nextInt();
		
		double spent;
		double sum = 0;
		double average = 0;
		int i = n;
		
		//add amount spent in the past n weeks
		while(i >= 1)
		{	
			spent = input.nextDouble();
			
			sum = sum + spent;
			i = i - 1;
		}
		
		//calculate average
		average = sum/n;
		double allowed_to_spend = average/2;
		
		System.out.println("Silvia, you can only spend $" +allowed_to_spend + " shopping this week if you want to go to Europe.");
		
	}	
}