import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Array<E> {

	private E data[]; // declared to be an Object since it would be too
	// complicated with generics
	private int size;

	public Array(int size) {
		data = (E[]) new Object[size];
		this.size = size;
	}

	public void set(int position, E o) {
		if (position >= 0 && position < size)
			data[position] = o;
		else
			System.out.println("Ne moze da se vmetne element na dadenata pozicija");
	}

	public E get(int position) {
		if (position >= 0 && position < size)
			return data[position];
		else
			System.out.println("Ne e validna dadenata pozicija");
		return null;
	}

	public int getLength() {
		return size;
	}

	public int find(E o) {
		for (int i = 0; i < size; i++) {
			if (o.equals(data[i]))
				return i;
		}
		return -1;
	}

	public void insert(int position, E o) {
// before all we check if position is within range
		if (position >= 0 && position <= size) {
// first resize the storage array
			E[] newData = (E[]) new Object[size + 1];
// copy the data prior to the insertion
			for (int i = 0; i < position; i++)
				newData[i] = data[i];
// insert the new element
			newData[position] = o;
// move the data after the insertion
			for (int i = position; i < size; i++)
				newData[i + 1] = data[i];
// replace the storage with the new array
			data = newData;
			size = size + 1;
		}
	}

	public void delete(int position) {
// before all we check if position is within range
		if (position >= 0 && position < size) {
// first resize the storage array
			E[] newData = (E[]) new Object[size - 1];
// copy the data prior to the delition
			for (int i = 0; i < position; i++)
				newData[i] = data[i];
// move the data after the deletion
			for (int i = position + 1; i < size; i++)
				newData[i - 1] = data[i];
// replace the storage with the new array
			data = newData;
			size = size - 1;
		}
	}

	public void resize(int newSize) {
// first resize the storage array
		E[] newData = (E[]) new Object[newSize];
// copy the data
		int copySize = size;
		if (newSize < size)
			copySize = newSize;
		for (int i = 0; i < copySize; i++)
			newData[i] = data[i];
// replace the storage with the new array
		data = newData;
		size = newSize;
	}



	public static int brojDoProsek(Array<Integer> niza) {
		// Vashiot kod tuka...
		int dolzina = niza.size;
		double prosek;
		int sum = 0;
		for(int i=0; i<niza.size; i++) {
			sum += niza.get(i);
		}
		prosek = sum/dolzina;

	}

	public static void main(String[] args) throws IOException {
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
		String s = stdin.readLine();
		int N = Integer.parseInt(s);

		// Vashiot kod tuka...
		Array<Integer> niza = new Array<Integer>(N);
		for(int i=0; i<N; i++) {
			s = stdin.readLine();
			niza.set(i,Integer.parseInt(s));
		}

		System.out.println(brojDoProsek(niza));
	}

}