#include <bits/stdc++.h>
#define pb push_back
using namespace std;
int inf = 1e9 + 1;
int a[3005][3005], n, m;
struct st{
int val, i, j;
};
vector<st> v;
int main()
{
cin >> n >> m;
for(int i = 1; i <= n; ++ i) {
for(int j = 1; j <= m; ++ j) {
cin >> a[i][j];
st temp;
temp.val = a[i][j], temp.i = i, temp.j = j;
v.pb(temp);
}
}
int res = 0;
for(int i = 0; i < v.size(); ++ i) {
for(int j = i; j < v.size(); ++ j) {
res = max(res, (abs(v[i].val - v[j].val) - (abs(v[i].i - v[j].i) + abs(v[i].j - v[j].j) + 1)));
//cout << i << ' ' << j << "-> " << (abs(v[i].val - v[j].val) - (abs(v[i].i - v[j].i) + abs(v[i].j - v[j].j) + 1)) << '\n';
}
}
cout << res;
return 0;
}
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