n = int(input())
if n == 1:
    print(1)
    exit()

A = [[0]*n for _ in range(n)]
for i in range(n):
    r = []
    *a, = input().split()
    for j in range(n):
        A[j][i] = -20 if a[j] == "?" else int(a[j])
        if a[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])