import numpy as np
n = int(input())
a = list(map(int,input().split()))
su1 = (sum(a)*2)
b1 = n*2
d1 = (0+2*(n-1))*n//2
su2 = 0
b2 = 0
d2 = 0
for i in range(n):
  su2 += a[i] * (i)*2
  b2 += (i)*2
  d2 += ((i)**2)*2
kake = np.array([[b1,d1],[b2,d2]])
ans = np.array([su1,su2])
ans = np.dot(np.linalg.inv(kake),ans)
print(ans[0],ans[1])
kota = 0
for i in range(n):
  kota += (a[i]-ans[0]-ans[1]*i)**2
print(kota)