#define taskname "D"
#include <bits/stdc++.h>
#define ii pair<int,int>
#define ff first
#define ss second

using namespace std;
int n, m;

/**
- Leftmost column
- Rightmost column
- In the middle
**/

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    cin>>n>>m;
    bool sw = 0;
    if (n > m) swap(n, m), sw = 1;
    vector<ii> ans;
    for (int i=1; i<=n; i++) ans.emplace_back(i, 1);
    for (int i=1+(n==m); i<=n-(n==m); i++) ans.emplace_back(i, m);
    if (n & 1)
    {
        int mid = (n+1)/2;
        int st = mid + 1, ed = m - mid;
        for (int i=st; i<=ed; i++) ans.emplace_back(mid, i);
    }
    else
    {
        int mid = n/2;
        int st = n / 2 + 2, ed = m - n / 2 - 1;
        for (int i=st; i<=ed; i+=2) ans.emplace_back(mid, i), ans.emplace_back(mid+1, i);
    }
    cout<<ans.size()<<"\n";
    for (auto [i, j]: ans)
    {
        if (sw) swap(i, j);
        cout<<i<<" "<<j<<"\n";
    }
}