#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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