import numpy as np
n = int(input())
LST = []
mean1 = 0
for x in input().split():
    x = int(x)
    mean1 += x
    LST.append(x)
mean1 /= n
mean2 = (n - 1) / 2
LST = np.array(LST) - mean1
L2 = np.array(range(n)) - mean2
Sxy = 0
Sx2 = 0
for i in range(n):
    Sxy += LST[i] * L2[i]
    Sx2 += L2[i] ** 2
d = Sxy / Sx2 
b = mean1 - a * mean2
LST += mean1
ai = b
cost = 0
for x in LST:
    cost += (x - ai) ** 2
    ai += d
print(b, d)
print(cost)