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