N = int(input())
A = list(map(int, input().split()))
sx, sx2, sy, sxy = 0, 0, 0, 0
for i in range(N):
    sx += i
    sx2 += i ** 2
    sy += A[i]
    sxy += i * A[i]
    
a = (N * sxy - sx * sy)/(N * sx2 - sx ** 2)
b = (sx2 * sy - sxy * sx)/(N * sx2 - sx ** 2)
ans = 0
for i in range(N):
    ans += (a * i + b - A[i])**2
print(b, a)
print(ans)