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#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr);

    const int n = 100;
    int k;
    cin >> k;
    int cur = 1;
    int id = 1;
    cout << n << "\n";
    while(id < n) {
        if(k == 1) {
            cout << id + 1 << " -1\n";
            id++;
        }
        else if(k % 2 == 0) {
            cout << id + 1 << " " << id + 2 << "\n";
            id++;
            cout << id + 1 << " -1\n";
            id++;
            k /= 2;
        }
        else {
            cout << id + 1 << " " << n << "\n";
            id++;
            k--;
        }
    }
    cout << "-1 -1\n";



    return 0;
}