#include using namespace std; #define rep(i, n) for (int i = 0; i < (n); i++) #define rep1(i, n) for (int i = 1; i <= (n); i++) #define rrep(i, n) for (int i = n - 1; i >= 0; i--) #define rrep1(i, n) for (int i = n; i >= 1; i--) #define all(x) x.begin(), x.end() #define rall(x) x.rbegin(), x.rend() #define eb emplace_back #define fi first #define se second #define sz(x) (int)(x).size() template using V = vector; template using VV = V>; typedef long long int ll; void speedUpIO() { cin.tie(nullptr); ios::sync_with_stdio(false); } template bool chmax(T &a, const T &b) { if (a < b) { a = b; return true; } return false; } template bool chmin(T &a, const T &b) { if (b < a) { a = b; return true; } return false; } /*--------------------------------------------------*/ typedef pair P; const int INF = 1e9; const ll LINF = 1e18; const int MAX = 100010; void solve() { int h, w; cin >> h >> w; VV a(h, V(w)); rep(i, h) rep(j, w) cin >> a[i][j]; int ans = 0; rep(i, h) { set

p; rep(j, w) p.insert({i, j}); rep(i2, h) { auto p2 = p; rep(j2, w) p2.insert({i2, j2}); int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(j2, w) { auto p2 = p; rep(i2, h) p2.insert({i2, j2}); int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(i2, h) { auto p2 = p; rep(j2, w) { if (i2 + j2 >= h) break; p2.insert({i2 + j2, j2}); } int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(j2, w) { auto p2 = p; rep(j2d, w) { if (j2 + j2d >= w) break; p2.insert({j2d, j2 + j2d}); } int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(i2, h) { auto p2 = p; rep(j2, w) { if (i2 - j2 < 0) break; p2.insert({i2 - j2, j2}); } int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(j2, w) { auto p2 = p; rep(j2d, w) { if (j2 - j2d < 0) break; p2.insert({j2d, j2 - j2d}); } int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } } rep(j, w) { set

p; rep(i, h) p.insert({i, j}); rep(i2, h) { auto p2 = p; rep(j2, w) p2.insert({i2, j2}); int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(j2, w) { auto p2 = p; rep(i2, h) p2.insert({i2, j2}); int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(i2, h) { auto p2 = p; rep(j2, w) { if (i2 + j2 >= h) break; p2.insert({i2 + j2, j2}); } int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(j2, w) { auto p2 = p; rep(j2d, w) { if (j2 + j2d >= w) break; p2.insert({j2d, j2 + j2d}); } int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(i2, h) { auto p2 = p; rep(j2, w) { if (i2 - j2 < 0) break; p2.insert({i2 - j2, j2}); } int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } rep(j2, w) { auto p2 = p; rep(j2d, w) { if (j2 - j2d < 0) break; p2.insert({j2d, j2 - j2d}); } int sum = 0; for (auto [pi, pj] : p2) sum += a[pi][pj]; chmax(ans, sum); } } cout << ans << "\n"; } int main() { speedUpIO(); int t = 1; // cin >> t; while (t--) { solve(); // cout << solve() << "\n"; // cout << (solve() ? "Yes" : "No") << "\n"; // cout << fixed << setprecision(15) << solve() << "\n"; } return 0; }