#include <bits/stdc++.h>

using namespace std;

using int64 = long long;

int main() {
  int N, A[1000];

  cin >> N;
  for(int i = 0; i < N; i++) cin >> A[i];

  tuple< double, double, double > ret(1e30, 1e30, 1e30);
  double left = -400000, right = 400000;

  auto check2 = [&](double real_d) {
    auto check = [&](double a) {
      double b = a;
      double cost = 0.0;
      for(int j = 0; j < N; j++) {
        cost += (A[j] - a) * (A[j] - a);
        a += real_d;
      }
      ret = min(ret, make_tuple(cost, b, real_d));
      return cost;
    };

    double low = -400000, high = 400000;
    for(int j = 0; j < 300; j++) {
      double latte = (low * 2 + high) / 3;
      double malta = (low + high * 2) / 3;
      if(check(latte) < check(malta)) high = malta;
      else low = latte;
    }
    return check(low);
  };


  for(int i = 0; i < 300; i++) {
    double aa = (left * 2 + right) / 3;
    double bb = (left + right * 2) / 3;
    if(check2(aa) < check2(bb)) right = bb;
    else left = aa;
  }
  cout << fixed << setprecision(10) << get< 1 >(ret) << " " << get< 2 >(ret) << endl << get< 0 >(ret) << endl;
}