// #ifdef __AVX2__
// #pragma GCC target "avx2"
// #endif
// #pragma GCC optimize "O3"
// #pragma GCC optimize "unroll-loops"
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define int long long
#define elif else if
#define all(l) begin(l),end(l)
#define rall(l) rbegin(l),rend(l)
#define append push_back
#define print(l) for(auto i:l) cout<<i<<' '; cout<<endl;
#define pprint(a,b) cout<<a<<' '<<b<<endl;
#define inp(l) for(auto &i:l) cin>>i;
// #define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define pai make_pair
#define endl "\n"
#define pii pair<int,int>
#define fi first
#define se second
#define vec vector
// const int mod=998244353;
const int mod1=998244353;
const int mod=1e9+7;
const int N=2e5+5;
int iter=1,itera=1;
void solve(){
int n,m;
cin>>n>>m;
vec<vec<int>>g(n,vec<int>(m));
for(auto &i:g) for(auto &j:i) cin>>j;
vec<vec<int>>a;
for(int i=0;i<n;i++){
for(int j=0;j<m;j++)
a.append({g[i][j],i,j});
}
sort(all(a));
int si=n*m,ans=0;
for(int i=0;i<si;i++){
for(int j=i;j<si;j++){
int x=a[j][0]-a[i][0];
x-=abs(a[j][1]-a[i][1])+abs(a[j][2]-a[i][2]);
x--;
ans=max(ans,x);
}
}
cout<<ans<<endl;
}
signed main(){
// freopen("","r",stdin);
// freopen("","w",stdout);
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cout<<fixed<<setprecision(20);
// cin>>itera;
for(iter=1;iter<=itera;iter++) solve();
}
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