#include <bits/stdc++.h>
#ifdef LOCAL
#include "debug.h"
#else
#define dbg(x...)
#endif
using namespace std;
inline void optimizeIO(void) {
    ios::sync_with_stdio(false);
    cin.tie(NULL), cout.tie(NULL);
}
int main(int argc, char const *argv[]) {
    int n, m, flip = 0;
    optimizeIO(), cin >> n >> m;
    if (n == m) {
        cout << 2 * n - 2 << endl;
        for (int i = 1; i <= n; i++) {
            cout << "1 " << i << '\n';
        }
        for (int i = 2; i < n; i++) {
            cout << n << ' ' << i << '\n';
        }
        return 0;
    }
    vector<pair<int, int>> ans;
    if (n > m) {
        swap(n, m), flip = 1;
    }
    for (int i = 1; i <= n; i++) {
        ans.push_back({i, 1});
        ans.push_back({i, m});
    }
    if (n & 1) {
        int mid = (n + 1) / 2;
        for (int i = mid + 1; i <= m - mid; i++) {
            ans.push_back({mid, i});
        }
    } else {
        int mid = n / 2;
        for (int i = mid + 2; i <= m - mid - 1; i += 2) {
            ans.push_back({mid, i});
            ans.push_back({mid + 1, i});
        }
    }
    cout << ans.size() << '\n';
    for (auto &p : ans) {
        if (!flip) {
            cout << p.first << ' ' << p.second << '\n';
        } else {
            cout << p.second << ' ' << p.first << '\n';
        }
    }
    return 0;
}