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//runda 5C
#include <iostream>
#include <bitset>
using namespace std;

int wierz[2][150];

int main() {
  ios_base::sync_with_stdio(0);
  int k, iB, startBit, ostWiez;

  fill_n(wierz[0], 150, -1);
  fill_n(wierz[1], 150, -1);

  cin >> k;
  string binarka =  bitset<32>(k).to_string();
  iB = 0;
  while(binarka[iB] == '0')
    ++iB;
  startBit = 32 - iB;
  if(startBit == 1) {
    cout << 2 << endl;
    cout << "2 -1" << endl;
    cout << "-1 -1";
    return 0;
  }
  ostWiez = (startBit - 1) * 3 +1;
  for(int i = 1; i < ostWiez; ++i) {
    wierz[0][i] = i + 1;
    if((i - 2) % 3 == 0)
      wierz[1][i] = i + 2;
  }
  for(int i = 1; i < startBit; ++i)
    if(binarka[32 - i] == '1')
      wierz[1][(i - 1) * 3 + 1] = ostWiez;

  cout << ostWiez << endl;
  for(int i = 1; i <= ostWiez; ++i)
    cout << wierz[0][i] << " " << wierz[1][i] << endl;

  return 0;
}