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)