#include <bits/stdc++.h>
using namespace std;
long long x;
vector<pair<long long, long long> > res;
int main() {
  ios_base::sync_with_stdio(0);
  ;
  cin >> x;
  if (x == 1) {
    cout << 1 << endl << "1 1";
    return 0;
  }
  for (long long i = 1; i <= 2000000; i++) {
    long long n = i;
    long long tam = 6 * x - 2 * n * n * n - 3 * n * n - n;
    if (tam % (3 * n * (n + 1)) == 0 && tam >= 0) {
      long long m = tam / (3 * n * (n + 1)) + n;
      res.push_back(make_pair(n, m));
    }
  }
  if (res[res.size() - 1].first == res[res.size() - 1].second) {
    cout << res.size() * 2 - 1 << endl;
    for (int i = 0; i < res.size(); i++)
      cout << res[i].first << " " << res[i].second << endl;
    for (int i = res.size() - 2; i >= 0; i--)
      cout << res[i].second << " " << res[i].first << endl;
  } else {
    cout << res.size() * 2 << endl;
    for (int i = 0; i < res.size(); i++)
      cout << res[i].first << " " << res[i].second << endl;
    for (int i = res.size() - 1; i >= 0; i--)
      cout << res[i].second << " " << res[i].first << endl;
  }
  return 0;
}
