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#include <bits/stdc++.h>

using namespace std;

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int k;  cin >> k;
    int bubbles = 31 - __builtin_clz(k);
    int sticks = __builtin_popcount(k) - 1;
    int total = (bubbles + 1) * 2 + sticks;
    if(k == 1){
        cout << "2\n2 -1\n-1 -1\n";
        return 0;
    }
    cout << total << "\n";
    // cout << bubbles << " " << sticks << "\n";
    int it = 2;
    for(int i = 0; i < bubbles; i++){
        if(k & (1 << i)){
            cout << it++ << " " << total - 2 * (i + 1) << "\n"; 
        }
    }
    it--;
    cout << it + 1 << " " << it + 2 << "\n";    // łączoncy dodatkowe z resztą
    it = it + 2;
    for(int i = 0; i < bubbles - 1; i++){
        cout << it + 1 << " " << it + 2 << "\n" << it + 1 << " " << it + 2 << "\n";
        it = it + 2;
    }
    cout << total << " " << "-1\n" << total << " " << "-1\n" << "-1 -1\n";
}