n = int(input())
Y = list(map(int, input().split()))
X = list(range(n))

sumX = sum(X)
sumY = sum(Y)
sumX2 = 0
sumXY = 0
for i in range(n):
    sumX2 += X[i]**2
    sumXY += X[i] * Y[i]

b = (sumX2 * sumY - sumXY * sumX) / (n * sumX2 - sumX**2)
d = (n * sumXY - sumX * sumY) / (n * sumX2 - sumX**2)
print(b, d)
c = 0.0
for i in range(n):
    c += (b + d * X[i] - Y[i])**2
print(c)