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

#define ll long long
#define all(x) x.begin(), x.end()
#define pb push_back
#define mp make_pair
#define ps push
#define in insert
#define f first
#define s second
#define nl cout<<"\n"
#define ca(v) for(auto i:v) cout<<i<<" ";
#define cbit(x) __builtin_popcount(x)
#define gcd(a, b) __gcd(a, b)
#define lcm(a, b) (a*b/gcd(a, b))
const int xm[4] = {-1, 1, 0, 0};
const int ym[4] = {0, 0, -1, 1};
const int MOD = 1e9 + 7;
const int MAXN = 5e5 + 5;
const ll POW = 9973;

void out(int x, int y, int swp){
    if(swp) cout<<y<<" "<<x<<"\n";
    else cout<<x<<" "<<y<<"\n";
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    if (fopen("input.in", "r")) {
        freopen("input.in", "r", stdin);
        freopen("output.out", "w", stdout);
    }
    ll n, m;
    cin>>n>>m;
    int swp = 0;
    if(n > m){
        swap(n, m);
        swp = 1;
    }
    ll best_config = -1;
    ll best = -1;
    for(int i=1; i<=n; i++){
        if(i * ((m + i - 1) / i) > best){
            best_config = i;
            best = i * ((m + i - 1) / i);
        }
    }
    int y = 1;
    cout<<best<<"\n";
    for(ll i=1; i<= (m + best_config - 1) / best_config; i++){
        for(int j=1; j<=best_config; j++){
            out(j, y, swp);
        }
        y += best_config;
    }
}