n = int(input())
if n == 1:
	exit(print(1))
a = [[0] * n for _ in range(n)]
for i in range(n):
	k = list(input().split())
	for j in range(n):
		a[j][i] = -20 if k[j] == "?" else int(k[j])
		if k[j] == "?":
			x, y = j, i
def check(a):
	def f(i, j):
		return sum(p * q for p, q in zip(a[i], a[j]))
	v = f(0, 0)
	for i in range(n):
		for j in range(n):
			if i != j and f(i, j): return 0
	return 1
while not check(a):
	a[x][y] += 1
print(a[x][y])