#include <iostream>
int main() {
	int N;
	std::cin >> N;
	int* A = new int[N];
	for (int i = 0; i < N; i++) {
		std::cin >> A[i];
	}

	int Sum = 0;
	for (int i = 0; i < N; i++) {
		Sum += A[i];
	}

	double Avg = (double)Sum / (double)N;

	std::cout << Avg << std::endl;

	return 0;
}