import numpy as np
n = int(input())
Y = []
meany = 0
for x in input().split():
    x = int(x)
    meany += x
    Y.append(x)
meany /= n
meanx = (n - 1) / 2
Y = np.array(Y) - meany
X = np.array(range(n)) - meanx

# print(X)

Sxy = 0
Sx2 = 0
for x, y in zip(X,Y):
    Sxy += x * y
    Sx2 += x ** 2
d = Sxy / Sx2 
b = meany - d * meanx
Y += meany
ai = b
cost = 0
for x in Y:
    cost += (x - ai) ** 2
    ai += d
print(b, d)
print(cost)