#include <bits/stdc++.h>
using namespace std;
const int inf = -1 << 30;
const int maxn = 101;
int seq[maxn];
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < (n); i++) scanf("%d", &seq[i]);
  long double rs = 0, ans = n * 100;
  for (int i = 0; i < (n); i++) {
    rs = rs + (seq[i] / (long double)100);
  }
  ans = rs / ans;
  cout << ans * 10000 << endl;
  return 0;
}
