#include <iostream>
using namespace std;

int n, m;
bool f;

inline int ceil(int x, int y) {
	return (x % y) ? (x / y + 1) : (x / y);
}

int cnt;

inline void out(int x, int y) {
	if (f) swap(x, y);
	cout << x << " " << y << "\n";
	cnt++;
}

int main() {
	cin >> n >> m;
	if (n == m) {
		cout << n + n - 2 << "\n";
		for (int i = 1; i <= n; i++) {
			cout << "1 " << i << "\n";
		}
		for (int i = 2; i < n; i++) {
			cout << n << " " << i << "\n";
		}
		return 0;
	}
	if (n > m) {
		swap(n, m); f = 1;
	}
	if (m % 2 || n % 2) {
		cout << n + m - 1 << "\n";
	} else {
		cout << n + m - 2 << "\n";
	}
	for (int i = 1; i <= n; i++) {
		out(i, 1);
		out(i, m);
//		cout << "1 " << i << "\n";
//		cout << m << " " << i << "\n";
	}
	if (n % 2) {
		int bod = n / 2 + 1;
		for (int i = bod + 1; i <= m - bod; i++) {
//			cout << n / 2 + 1 << " " << i << "\n";
			out(n / 2 + 1, i);
		}
	} else {
		int bod = n / 2 + 1;
		for (int i = bod + 1; i <= m - bod; i += 2) {
			out(n / 2, i);
			out(n / 2 + 1, i);
//			cout << n / 2 << " " << i << "\n";
//			cout << n / 2 + 1 << " " << i << "\n";
		}
	}
//	cout << cnt << endl;
}