#include <iostream>
#include <vector>
using namespace std;

const int N = 2e3 + 5;

using pii = pair<int, int>;

int main() {
    int k;
    cin.tie(0), cout.tie(0), ios::sync_with_stdio(0);
    cin >> k;
    int n = 1024;
    cout << n << '\n';
    for (int i = 1; i <= n; i += 4) {
        cout << "1 2 2 1 ";
    }
    cout << '\n';
    for (int i = 5; i <= n; i += 2) {
        int j = i % 4 == 1 ? 3 : 1;
        for (; j < i; j += 4) {
            cout << i << " " << j << '\n';
        }
    }

    for (int i = 2; i <= n; i += 2) {
        int j = i % 4 == 2 ? 4 : 2;
        for (; j < i; j += 4) {
            cout << i << " " << j << '\n';
        }
        cout << i << " " << i - 1 << '\n';
    }
}