N = int(input())
A = list(map(int, input().split()))
sumx = 0
sumy = 0
sumxy = 0
sumx2 = 0
for i in range(N):
    sumx += i
    sumy += A[i]
    sumxy += i * A[i]
    sumx2 += i * i
d = (N * sumxy - sumx * sumy) / (N * sumx2 - sumx ** 2)
b1 = (sumx2 * sumy - sumxy * sumx) / (N * sumx2 - sumx ** 2)
c = 0
for i in range(N):
    c += (A[i] - (d * i + b1)) ** 2
print(b1,d)
print(c)