#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  cout << n + (m - 1) << '\n';
  for (int i = 1; i <= n; i++) {
    cout << i << " " << 1 << '\n';
  }
  for (int i = 2; i <= m; i++) {
    cout << 1 << " " << i << '\n';
  }
}
