#include <bits/stdc++.h>
#include <atcoder/all>
#define SELECTER(_1,_2,_3,SELECT,...) SELECT
#define rep1(i,n) for(int i=0;i<(int)n;++i)
#define rep2(i,a,n) for(int i=(int)a;i<(int)n;++i)
#define rep(...) SELECTER(__VA_ARGS__,rep2,rep1)(__VA_ARGS__)
#define RSELECTER(_1, _2, _3, RSELECT, ...) RSELECT
#define rrep1(i,n) for(int i=(int)n-1;i>=0;--i)
#define rrep2(i,a,n) for(int i=(int)n-1;i>=(int)a;--i)
#define rrep(...) RSELECTER(__VA_ARGS__, rrep2, rrep1)(__VA_ARGS__)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define fi first
#define se second
#define PrintR LogOutput
#ifdef _DEBUG
#define Log(...) LogOutput(__VA_ARGS__)
#else
#define Log(...)
#endif
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
using pii=pair<int,int>;
using pll=pair<long long,long long>;
using pdd=pair<long double,long double>;
using tp=tuple<int,int,int>;
using tpll=tuple<ll,ll,ll>;
using veci=vector<int>;
using vecpii=vector<pair<int,int>>;
using vecll=vector<long long>;
using vecpll=vector<pair<long long,long long>>;
using vecpdd=vector<pair<long double,long double>>;
using vecs=vector<string>;
using vecb=vector<bool>;
using vecd=vector<long double>;
using vectp=vector<tp>;
using vectpll=vector<tpll>;
using mint=modint998244353;
using mint10=modint1000000007;
template<typename T, typename S>
istream& operator>>(istream& in, pair<T, S>& a){return in >> a.first >> a.second;}
template<typename T, typename S>
ostream& operator<<(ostream& out, const pair<T, S>& a){return out << a.first << ' ' << a.second;}
ostream& operator<<(ostream& out, const mint& a){return out << a.val();}
ostream& operator<<(ostream& out, const mint10& a){return out << a.val();}
ostream& operator<<(ostream& out, const modint& a){return out << a.val();}
template<typename T>
ostream& operator<<(ostream& out, const vector<T>& d){for(int i = 0 ; i < d.size() ; ++i) out << d[i] << (i == d.size() - 1 ? "" : " "); return out;}
template<typename T, typename S>
pair<T, S> operator+(const pair<T, S>& a, const pair<T, S>& b){return {a.fi + b.fi, a.se + b.se};}
template<typename T, typename S>
pair<T, S> operator-(const pair<T, S>& a, const pair<T, S>& b){return {a.fi - b.fi, a.se - b.se};}
template<class T> inline bool chmax(T& a,T b){if(a<b) {a=b;return true;} return false;}
template<class T> inline bool chmin(T& a,T b){if(a>b) {a=b;return true;} return false;}
bool Judge(int i, int j, int h, int w){return i < 0 || j < 0 || i >= h || j >= w;}

constexpr ll INF=numeric_limits<ll>::max() / 4;
constexpr ll MOD=998244353;
const int vi[] = {0, 1, 0, -1}, vj[] = {1, 0, -1, 0};

template<typename... Args>
void LogOutput(Args&&... args){
	stringstream ss;
	((ss << args << ' '), ...);
	cout << ss.str().substr(0, ss.str().length() - 1) << endl;
}
template<typename T>
void LogOutput(vector<vector<T>>& data){for(auto d : data) LogOutput(d);}

int main(){
	ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	int h, w;cin>>h>>w;
	vector a(h, veci(w));
	rep(i, h) rep(j, w) cin>>a[i][j];
	vecll s(h, 0), s2(w, 0), s3(h + w - 1, 0), s4(h + w - 1, 0);
	rep(i, h) rep(j, w){
		s[i] += a[i][j];
		s2[j] += a[i][j];
		s3[h - i - 1 + j] += a[i][j];
		s4[h - i - 1 + w - j - 1] += a[i][j];
	}
	ll ans = 0;
	rep(i, h){
		rep(j, h) if(i != j) chmax(ans, s[i] + s[j]);
		rep(j, w) chmax(ans, s[i] + s2[j] - a[i][j]);
		int v = -(h - i - 1), v2 = w - 1 + h - 1 - i;
		rep(j, h + w - 1){
			chmax(ans, s[i] + s3[j] - (v >= 0 && v < w ? a[i][v] : 0));
			chmax(ans, s[i] + s4[j] - (v2 >= 0 && v2 < w ? a[i][v2] : 0));
			v++;
			v2--;
		}
	}
	rep(i, w){
		rep(j, w) if(i != j) chmax(ans, s2[i] + s2[j]);
		int v = h - 1 + i, v2 = w - 1 - i + h - 1;
		rep(j, h + w - 1){
			chmax(ans, s2[i] + s3[j] - (v >= 0 && v < h ? a[v][i] : 0));
			chmax(ans, s2[i] + s4[j] - (v2 >= 0 && v2 < h ? a[v2][i] : 0));
			v--;
			v2--;
		}
	}
	int vi = h - 1 + w / 2, vj = w / 2;
	rep(i, h + w - 1){
		rep(j, h + w - 1) if(i != j) chmax(ans, s3[i] + s3[j]);
		rep(j, h + w - 1) if(i != j) chmax(ans, s4[i] + s4[j]);
		chmax(ans, s3[i] + s4[i] - (w % 2 && vi >= 0 && vi < h ? a[vi][vj] : 0));
		vi--;
	}
	cout<<ans<<endl;
}