import sys

# sys.setrecursionlimit(200005)
# sys.set_int_max_str_digits(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()

dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = -1-(-1 << 31)
# inf = -1-(-1 << 63)
# md = 10**9+7
md = 998244353

n = II()
yy = LI()

ave_x = (n-1)/2
ave_x2 = n*(n-1)*(2*n-1)/6/n
ave_y = ave_xy = 0
for x, y in enumerate(yy):
    ave_y += y
    ave_xy += x*y
ave_y /= n
ave_xy /= n

con = ave_xy-ave_x*ave_y
std2 = ave_x2-ave_x**2

a = con/std2
b = -a*ave_x+ave_y

ans=0
for x,y in enumerate(yy):
    ans+=(a*x+b-y)**2

print(b,a)
print(ans)