#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define int ll
#define all(v) (v).begin(), (v).end()
#define pb push_back

void dbg_out() { cerr << endl; }
template <typename H, typename... T>
void dbg_out(H h, T... t) { cerr << ' ' << h; dbg_out(t...); }
#define dbg(...) { cerr << #__VA_ARGS__ << ':'; dbg_out(__VA_ARGS__); }

int n, m;

void solve () {
    cin >> n >> m;

    bool troca = false;
    if (n > m) swap (n, m), troca = true;

    vector<pair<int, int>> ans;
    for (int y = 1; y <= m; y += n) {
        for (int x = 1; x <= n; x++) ans.pb ({x, y});
        if (y + n > m) {
            // se estourou
            int fim = m - y;
            int lim_cima = n - fim, lim_baixo = 1 + fim;
            for (int j = lim_cima + 1; j < lim_baixo; j++) ans.pb ({j, m});
        }
    }

    cout << ans.size () << "\n";
    for (auto [x, y] : ans) {
        if (troca) cout << y << " " << x << "\n";
        else cout << x << " " << y << "\n";
    }
}

signed main() {
	ios::sync_with_stdio(false); cin.tie(0);
	solve();
}