#include <bits/stdc++.h>
signed main ()
{
	std::ios::sync_with_stdio(false); std::cin.tie(0); std::cout.tie(0);
	int n, m, f = 0; std::cin >> n >> m;
	if (n > m) std::swap(n, m), f = 1;
	std::vector<std::pair<int, int>> ans;
	if (n == 1) for (int i = 1; i <= m; i++) ans.emplace_back(1, i);
	else
	{
		for (int i = 1; i + n <= m; i += n) for (int j = 1; j <= n; j++) ans.emplace_back(j, i);
		if (m % n == 0)
		{
			for (int j = 1; j <= n; j++) ans.emplace_back(j, m - n + 1);
			for (int j = 1 + 1; j <= n - 1; j++) ans.emplace_back(j, m);
		}
		else
		{
			int t = ((m / n - 1) * n + m) / 2 + 1;
			for (int j = n - (m - t) + 1; j <= 1 + (m - t) - 1; j++) ans.emplace_back(j, t);
			for (int j = 1; j <= n; j++) ans.emplace_back(j, m);
		}
	}
	std::cout << ans.size() << '\n';
	for (auto &[u, v]: ans) if (f) std::swap(u, v);
	for (auto [u, v]: ans) std::cout << u << " " << v << "\n";
	return 0;
}