""" 

愚直

"""

import sys
from collections import deque
import itertools
import heapq

def exist(A):

    q = []
    #print (A)

    for i in range(H):
        for j in range(W):
            if A[i][j] != None and A[i][j] >= 0:
                heapq.heappush( q , (A[i][j],i,j) )
            if A[i][j] == None:
                A[i][j] = float("inf")

    while q:
        cost,i,j = heapq.heappop(q)
        if cost != A[i][j]:
            continue

        for x,y in ((i-1,j),(i+1,j),(i,j-1),(i,j+1)):
            if 0 <= x < H and 0 <= y < W:
                if A[x][y] > A[i][j] + 1:
                    A[x][y] = A[i][j] + 1
                    heapq.heappush( q, (A[x][y],x,y) )

                    if x==0 or x==H-1 or y==0 or y==W-1:
                        return False

    return True

import sys

mod = 998244353

H,W = map(int,input().split())
assert 3 <= H <= 1000
assert 3 <= W <= 1000

A = [[None] * W for i in range(H)]

# input
A[0] = list(map(int,input().split()))
for i in range(1,H-1):
    A[i][0],A[i][-1] = map(int,input().split())
A[-1] = list(map(int,input().split()))

for i in range(H):
    for j in range(W):
        if A[i][j] != None:
            assert 1 <= A[i][j] <= 2000

flag = True
for i in range(H):
    for j in range(W):
        if A[i][j] == None:
            continue

        for i2,j2 in ( (i+1,j),(i,j+1) ):
            if i2 < H and j2 < W and A[i2][j2] != None:

                if abs(A[i][j] - A[i2][j2]) > 1:
                    flag = False

if not flag:
    print (-1)
    sys.exit()


yoko = []
tate = []

last = False
for i in range(H):
    diff = abs(A[i][0] - A[i][-1])
    if diff > W-1:
        yoko.append(i)

for j in range(W):
    diff = abs(A[0][j] - A[-1][j])
    if diff > H-1:
        tate.append(j)

if tate:
    A = [[ A[i][j] for i in range(H) ] for j in range(W)]
    H,W = W,H
    yoko,tate = tate,yoko

ans = 0

for bits in range((W-2)**len(yoko)):

    js = []
    for mmm in range(len(yoko)):
        js.append( bits % (W-2) + 1 )
        bits //= W-2

    B = [[ A[i][j] for j in range(W) ] for i in range(H)]
    for i,j in zip(yoko,js):
        B[i][j] = -1

    if exist(B):
        ans += 1

print (ans)