10
-405 -230 252 -393 -390 -259 97 163 81 -129
 3
10000 -10000 10000
 1
-10000
 20
-16 -23 29 44 -40 -50 -41 34 -38 30 -12 28 -44 -49 15 50 -28 38 -2 0

702.333333333333712
 10000.000000000016371
 0.000000000000000
 113.875000000000043

#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<double> v(n);
  double sum = 0;
  for (int i = 0; i < n; i++) {
    cin >> v[i];
    sum += v[i];
  }
  sum /= n;
  for (int i = 0; i < n; i++) {
    v[i] = v[i] - sum;
  }
  sum = -1e9;
  double s = 0;
  for (int i = 0; i < n; i++) {
    s += v[i];
    if (sum < s) sum = s;
    if (s < 0) s = 0;
  }
  cout << fixed << setprecision(7) << sum;
  return 0;
}
