1 #include <bits/stdc++.h>
 2 using namespace std;
 3 typedef long long ll;
 4 #define MS(a) memset(a,0,sizeof(a))
 5 #define MP make_pair
 6 #define PB push_back
 7 const int INF = 0x3f3f3f3f;
 8 const ll INFLL = 0x3f3f3f3f3f3f3f3fLL;
 9 inline ll read(){
10     ll x=0,f=1;char ch=getchar();
11     while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
12     while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
13     return x*f;
14 }
15 //
16 const int maxn = 500+10;
17
18 int n,m,sx,sy,sum;
19 int G[maxn][maxn],is_p[maxn][maxn],vis[maxn][maxn];
20 int dx[4] = {0,0,1,-1};
21 int dy[4] = {1,-1,0,0};
22
23 struct node{
24     int x,y;
25 };
26
27 bool ok(int x,int y){
28     return x>=1 && x<=n && y>=1 && y<=m && !vis[x][y];
29 }
30
31 bool check(int x){
32     MS(vis);
33     queue<node> q;
34     q.push(node{sx,sy}); vis[sx][sy] = 1;
35     int cnt = 1;
36     while(!q.empty()){
37         node now = q.front(); q.pop();
38         for(int i=0; i<4; i++){
39             int tx=now.x+dx[i];
40             int ty=now.y+dy[i];
41             if(ok(tx,ty) && abs(G[tx][ty]-G[now.x][now.y]) <= x){
42                 vis[tx][ty] = 1;
43                 q.push(node{tx,ty});
44                 cnt += is_p[tx][ty];
45                 if(cnt == sum) return true;
46             }
47         }
48     }
49     // return cnt == sum;
50     return false;
51 }
52
53 int main(){
54     n=read(),m=read();
55     int mi=INF,mx=-1;
56     for(int i=1; i<=n; i++)
57         for(int j=1; j<=m; j++){
58             G[i][j]=read();
59             mi=min(mi,G[i][j]);
60             mx=max(mx,G[i][j]);
61         }
62     for(int i=1; i<=n; i++)
63         for(int j=1; j<=m; j++){
64             is_p[i][j]=read();
65             sum += is_p[i][j];
66             if(is_p[i][j]) sx=i,sy=j;
67         }
68
69     int L=0,R=mx-mi,ans=0;
70     while(L<=R){
71         int mid = (L+R)/2;
72         if(check(mid)) ans=mid,R=mid-1;
73         else L=mid+1;
74     }
75
76     cout << ans << endl;
77
78     return 0;
79 }