package codeabbey;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class average_of_an_Array {
	public static void Main(String args[])throws IOException {
Scanner sc=new Scanner(System.in);
int array=0;
ArrayList<Integer>arr=new ArrayList<Integer>();

array=sc.nextInt();
for (int i=0;i<=array;i++) {
	int average=0;
	int a=sc.nextInt();
	arr.add(i,a);
	if(a==0) {
		for(int j:arr) {
			average+=arr.get(j);

		}
		average=average/i;
		System.out.println(average);
		arr.clear();
		break;
	}
}
sc.close();
}}