import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    long[] a = new long[n];
    for(int i = 0; i < n; i++) {
      a[i] = sc.nextLong();
    }
    long xy = 0;
    long x = 0;
    long y = 0;
    long x2 = 0;
    for(int i = 0; i < n; i++) {
      xy += (i * a[i]);
      x += i;
      y += a[i];
      x2 += (i * i);
    }
    double A = (double)(n * xy - x * y) / (double)(n * x2 - x * x);
    double B = (double)(x2 * y - xy * x) / (double)(n * x2 - x * x);
    double c = 0;
    for(int i = 0; i < n; i++) {
      double t = A * (double)i + B;
      c += ((double)((a[i] - t) * (a[i] - t))); 
    }
    System.out.println(B + " " + A);
    System.out.println(c);
  }
}