#include <bits/stdc++.h> using namespace std; #ifdef local #include <debug.hpp> #else #define debug(...) #endif #define rep(i, n) for (int i = 0; i < n; i++) template <class T> istream& operator>>(istream& I, vector<T>& V) {for (T& X : V) I >> X; return I;} 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;} vector<int> di = {-1, 1, 0, 0}, dj = {0, 0, -1, 1}; int inf = 2e9; long INF = 1e18; int main() { int x, y; cin >> x >> y; int n = 2 * x + x * (y - 2); vector<pair<int, int>> es; rep(i, x) { es.emplace_back(i, (i + 1) % x); } int idx = x, b = n - x; rep(i, x) { rep(j, y - 2) { if (j == 0) { es.emplace_back(i, idx++); } if (j == y - 3) { if (j == 0) { es.emplace_back(idx - 1, b++); } else { es.emplace_back(idx++, b++); } } if (j != 0 and j != y - 3) { es.emplace_back(idx - 1, idx++); } } } // vector<int> d(n); // for (auto [u, v] : es) { // d[u]++; // d[v]++; // } // debug(d); cout << n << " " << (int)es.size() << endl; for (auto [u, v] : es) { cout << u + 1 << " " << v + 1 << endl; } return 0; }