import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double N = scan.nextInt();
		double[]a = new double[(int)N];
		for(int i = 0; i < N; i++) {
			a[i] = scan.nextLong();
		}
		scan.close();
		double sum1 = 0;
		double sum2 = 0;
		for(int i = 0; i < N - 1; i++) {
			sum1 += a[0] - a[i + 1];
			sum2 += (i + 1)  * (a[0] - a[i + 1]);
		}
		double A = 2 * N;
		double B = N * (N - 1);
		double p = -2 * sum1;
		double C = 3 * N * (N - 1);
		double D = N * (N - 1) * (2 * N - 1);
		double q = -6 * sum2;
		double t = A * D - B * C;
		double x = (p * D - B * q) / t;
		double y = (A * q - p * C) / t;
//		System.out.println(A + " " + B + " " + C + " " + D);
//		System.out.println(p + " " + q);
		double b1 = a[0] + x;
		double cost = 0;
		for(int i = 0; i < N; i++) {
			double k = a[0] + x + i * y - a[i];
			k *= k;
			//BigDecimal bd = new BigDecimal(k);
			//BigDecimal bd2 = bd.setScale(10, BigDecimal.ROUND_HALF_UP);
			//double d = Double.parseDouble(bd2.toString());
			//System.out.println(d);
			cost += k;
		}
		System.out.println(b1 + " " + y);
		System.out.println(String.format("%.8f", cost));
	}
}