#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  float a, b, c, result, sum = 0;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a;
    sum = sum + a;
  }
  b = n * 100;
  result = sum / b;
  cout << result * 100;
}
