#include<bits/stdc++.h>

using namespace std;

#define int long long
#define double long double

#define pii pair<int,int>
#define vii vector<pii>

#define fi first
#define se second

#define pb push_back
const double eps=1e-12;

signed main(){
    int n;
    double r;
    cin >> n >> r;
    vii v;
    for (int i=0;i<=n;i++){
        for (int j=0;j<=n;j++){
            if (i>=r-eps && j>=r-eps && (n-i)>=r-eps && (n-j)>=r-eps){
                bool T=1;
                for (pii x:v) if ((x.fi-i)*(x.fi-i)+(x.se-j)*(x.se-j)<4*r*r-eps) T=0;
                if (T) v.pb(pii{i,j});
            }
        }
    }
    cout << v.size() << '\n';
    for (pii x:v) cout << x.fi << ' ' << x.se << '\n';

}