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 ans = 0;
double x = 0;
long long n;
int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  cin >> n;
  vector<double> v(n + 1);
  for (long long i = 1; i <= n; i++) cin >> v[i], x += v[i];
  x /= n * 1.000;
  for (long long i = 1; i <= n; i++) v[i] -= x;
  set<double> topick;
  double sj = 0.00;
  for (long long i = 1; i <= n; i++) {
    sj += v[i];
    ans = max(ans, fabs(sj * 1.000));
    if (topick.size()) {
      auto w = topick.rbegin();
      auto l = topick.begin();
      ans = max(ans, fabs(sj * 1.0000000000 - *w));
      ans = max(ans, fabs(sj * 1.0000000000 - *l));
    }
    topick.insert(sj);
  }
  cout << fixed << setprecision(9) << ans << endl;
}
