#include namespace { #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-function" #include #pragma GCC diagnostic pop using namespace std; using namespace atcoder; #define rep(i,n) for(int i = 0; i < (int)(n); i++) #define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--) #define all(x) begin(x), end(x) #define rall(x) rbegin(x), rend(x) template bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; } template bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; } using ll = long long; using P = pair; using VI = vector; using VVI = vector; using VL = vector; using VVL = vector; } int main() { ios::sync_with_stdio(false); cin.tie(0); int h, w; cin >> h >> w; VVI d(h, VI(w)); rep(i, h) rep(j, w) d[i][j] = i * w + j + 1; VI t; for(int i = 1; i < h; i += 2) { rep(z, 2) { for(int j = z; j < w; j += 2) t.emplace_back(d[i][j]); for(int j = z; j < w; j += 2) d[i][j] = t.back(), t.pop_back(); } } for(int j = 1; j < w; j += 2) { rep(z, 2) { for(int i = z; i < h; i += 2) t.emplace_back(d[i][j]); for(int i = z; i < h; i += 2) d[i][j] = t.back(), t.pop_back(); } } rep(i, h) rep(j, w) cout << d[i][j] << " \n"[j + 1 == w]; }