#include <cstdio>

#include <iostream>

#include <vector>

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<<" "<<m<<endl;

    return 0;

}