import numpy as np
INF = 10 ** 10

N = int(input())
X = np.arange(N,dtype = np.int64)
Y = np.array(input().split(),dtype = np.int64)

median_Y = Y.sum()/N
median_X = (N - 1)/2

Sx = ((X - median_X) ** 2).sum()/N
Sxy = ((X - median_X)*(Y - median_Y)).sum()/N
b1 = Sxy/Sx
b0 = median_Y - median_X*b1
cost = ((Y - b0 - b1*X)**2).sum()
print(b0,b1)
print(cost)