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

int main() {
  int n;
  scanf("%d", &n);
  int last = 100;
  printf("%d\n", last);
  int cur = 1;
  while (n) {
    printf("%d %d\n", cur + 1, cur + 2);
    int second = -1;
    if (n & 1) {
      second = last;
    }
    printf("%d %d\n", cur + 3, second);
    printf("%d %d\n", cur + 3, -1);
    cur += 3;
    n /= 2;
  }
  while (cur <= last) {
    printf("-1 -1\n");
    cur++;
  }
}