#include <bits/stdc++.h>

using namespace std;

using int64 = long long;

#define double long double

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 = -1e10, right = 1e10;

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

      double low = -1e5, high = 1e5;
      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;
}