#include<bits/stdc++.h>
using namespace std;
int n,m,ans,ansx;
int main() {
    cin>>n>>m;
    if (n>=m) {
        for (int x=1;x<=m;x++) {
            if (((n+x-1)/x)*x>ans) {
                ans=((n+x-1)/x)*x;
                ansx=x;
            }
        }
        cout<<ans<<endl;
        for (int x=1;x<=n;x+=ansx) {
            for (int y=1;y<=ansx;y++) cout<<x<<' '<<y<<endl;
        }
        return 0;
    }
    for (int x=1;x<=n;x++) {
        if (((m+x-1)/x)*x>ans) {
            ans=((m+x-1)/x)*x;
            ansx=x;
        }
    }
    cout<<ans<<endl;
    for (int y=1;y<=m;y+=ansx) {
        for (int x=1;x<=ansx;x++) cout<<x<<' '<<y<<endl;
    }
    return 0;
}
/*
#.#.#
oxoxo
#.#.#
.#.#.
#.#.#
.#.#.
xoxox
(x,y) (x+y-1,m+x-y)

****#
***.*.
**#*#*#
*.*.*.*.
#*#*#*#*#
*.*.*.*.*.
**#*#*#*#*#
***.*.*.*.
****#*#*#
*****.*.
******#
*/