#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define in insert
#define lb lower_bound
#define F first
#define S second
#define sz size()
#define all(v) v.begin(),v.end()
#define FOR1(x, n) for(int j = x; j <= n; j ++)
#define FOR(x, n, m, d) for(int x = n; x <= m; x += d)
#define FORR(x, n, m, d) for(int x = n; x >= m; x -= d)
#define nikita ios_base::sync_with_stdio(0), cin.tie(0);
const int N = 1000+5;
int a[N][N], b[N], pref[N], dp[N], c[N][3], d[N][3];
int n,m,k,sum=0,x,y, ans, r, cnt, l, mod = 1e9+7, mt[N];
bool used[N];
vector<int>g[N];
string s, str;
void solve(){
nikita
cin >> n >> m;
vector<pair<int, pair<int, int>>>q;
FOR(i, 1, n, 1){
FOR(j, 1, m, 1){
cin >> a[i][j];
q.pb({a[i][j], {i, j}});
}
}
sort(all(q));
ans = -1;
FOR(i, max((int)0, (int)q.sz-(int)200), q.sz-1, 1){
FOR(j, 0, i-1, 1){
ans = max(ans, q[i].F - q[j].F - abs(q[i].S.F - q[j].S.F) - 1 - abs(q[i].S.S - q[j].S.S));
}
FOR(j, i+1, q.sz-1, 1){
k = -q[i].F + q[j].F - abs(q[i].S.F - q[j].S.F) - 1 - abs(q[i].S.S - q[j].S.S);
ans = max(ans, k);
}
}
cout << ans;
}
signed main(){
nikita
int tt = 1;
if(!tt)cin >> tt;
FOR(i, 1, tt, 1)solve();
}
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