#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int n, m;
  cin >> n >> m;
  cout << n + m - 1 << endl;
  for (int i = 0; i < m; i++) cout << 1 << " " << i + 1 << endl;
  for (int i = 1; i < n; i++) cout << i + 1 << " " << 1 << endl;
}
