#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll ok = 0, ng = 1e6;
    while(ng-ok>1){
        ll md = (ok + ng) / 2;
        if(md*(md+3)/2<=1e9) ok = md;
        else ng = md;
    }
    cout << ok * 8 << '\n';
    int x = -1e9, y = 0;
    rep(i,ok){
        cout << x << " " << y << '\n';
        x++;
        y += i+1;
    }
    rep(i,ok){
        cout << x << " " << y << '\n';
        y++;
        x += i+1;
    }
    rep(i,ok){
        cout << x << " " << y << '\n';
        x++;
        y -= i+1;
    }
    rep(i,ok){
        cout << x << " " << y << '\n';
        y--;
        x += i+1;
    }
    rep(i,ok){
        cout << x << " " << y << '\n';
        x--;
        y -= i+1;
    }
    rep(i,ok){
        cout << x << " " << y << '\n';
        y--;
        x -= i+1;
    }
    rep(i,ok){
        cout << x << " " << y << '\n';
        x--;
        y += i+1;
    }
    rep(i,ok){
        cout << x << " " << y << '\n';
        y++;
        x -= i+1;
    }
    cout << flush;
    return 0;
}