// yukicoder: No.731 等差数列がだいすき
// bal4u 2019.8.19

#include <stdio.h>
#include <stdlib.h>

typedef long long ll;

//// 入出力関係
#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif

int in() { // 非負整数の入力
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf); while ((c = gc()) >= '0');
	return n;
}

int N;
int y[1003];

int main()
{
	int i;
	ll sx, sx2, sy, sxy;
	ll bo;
	double a, b;   // y = ax + b
	double cost, c;
	
	sx = sx2 = sy = sxy = 0;
	
	N = in();
	sx = (ll)N*(N+1)/2, sx2 = sx*(2*N+1)/3;
	for (i = 1; i <= N; i++) {
		y[i] = in();
		sy += y[i], sxy += i*y[i];
	}
	
	bo = N*sx2 - sx*sx;
	a = (double)(N*sxy - sx*sy) / bo;
	b = (double)(sx2*sy - sxy*sx) / bo;
	
	printf("%.15lf %.15lf\n", a+b, a);
	
	cost = 0, c = a+b;
	for (i = 1; i <= N; i++) {
		cost += (c-y[i])*(c-y[i]);
		c += a;
	}
	printf("%.15lf\n", cost);
	return 0;
}