#include <bits/stdc++.h>
using namespace std;
bool arr[1000];
string convert_int(long long int n) {
  stringstream ss;
  ss << n;
  return ss.str();
}
int convert_str(string s) {
  stringstream ss(s);
  long long int result;
  return (ss >> result ? result : 0);
}
void sieve(int bound) {
  int s = bound + 1;
  arr[0] = 0;
  arr[1] = 1;
  for (int i = 2; i < s; i++) {
    if (arr[i]) {
      for (int j = i * i; j < s; j++) {
        arr[j] = 0;
      }
    }
  }
}
bool isprime(int idx) { return arr[idx]; }
int divisors(int n, int b) { return (n / b); }
long long int gcd(long long int a, long long b) {
  if (b == 0)
    return a;
  else
    return gcd(b, a % b);
}
long long int lcm(long long int a, long long int b) {
  return (a * b) / gcd(a, b);
}
int main() {
  int n;
  cin >> n;
  float mixed = 0;
  for (int i = 0; i < n; i++) {
    int x;
    cin >> x;
    mixed += (x / 100.0);
  }
  cout << (mixed / n) * 100;
}
