#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001

int main(){
	
	int h,w;
	cin>>h>>w;
	vector a(h,vector<int>(w));
	rep(i,h){
		rep(j,w)cin>>a[i][j];
	}
	
	int ans = 0;
	vector<vector<pair<int,int>>> t;
	for(int i=-1;i<=1;i++){
		for(int j=-1;j<=1;j++){
			if(i==0&&j==0)continue;
			for(int m=-200;m<=200;m++){
				vector<pair<int,int>> c;
				rep(x,h){
					rep(y,w){
						if(i*x+y*j==m)c.emplace_back(x,y);
						
					}
				}
				t.push_back(c);
			}
			
		}
	}
	
	rep(i,t.size()){
		for(int j=i+1;j<t.size();j++){
			int sum = 0;
			rep(k,t[i].size())sum += a[t[i][k].first][t[i][k].second];
			rep(k,t[j].size()){
				if(!binary_search(t[i].begin(),t[i].end(),t[j][k]))sum += a[t[j][k].first][t[j][k].second];
			}
			ans = max(ans,sum);
			
		}
	}
	cout<<ans<<endl;
	
	return 0;
}