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;
double A[200005];
int main(int argc, const char* argv[]) {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int n, i;
  double s = 0, s1 = 0, s2 = 0;
  cin >> n;
  for (i = 0; i < n; i++) {
    cin >> A[i];
    s += A[i];
  }
  double x = s / n;
  for (i = 0; i < n; i++) A[i] = A[i] - x;
  s = 0;
  for (i = 1; i < n; i++) {
    if (A[i] + A[i - 1] > A[i]) A[i] += A[i - 1];
    s = max(s, A[i]);
  }
  cout << fixed;
  cout << setprecision(7);
  cout << s;
  return 0;
}
