#include <bits/stdc++.h>
using namespace std;
const int mod = 1000000007;
const double eps = 1e-7;
vector<pair<long long, long long> > ans;
vector<pair<long long, long long> > ans2;
int a[111111];
int main() {
  long long lol;
  cin >> lol;
  for (int x = 1; x < 2000000; x++) {
    long long cur = lol;
    cur *= 3ll;
    long long let = 1ll * x * (x + 1) / 2ll;
    if (cur % let == 0) {
      cur /= let;
      cur -= 1 + 2ll * x;
      if (cur % 3 == 0 && cur >= 0) {
        cur /= 3;
        long long y = cur;
        y += x;
        ans.push_back(make_pair(y, x));
        if (x != y) ans2.push_back(make_pair(x, y));
      }
    }
  }
  cout << ans.size() + ans2.size() << endl;
  for (int i = 0; i < ans2.size(); i++) {
    cout << ans2[i].first << " " << ans2[i].second << endl;
  }
  for (int i = ans.size() - 1; i >= 0; i--) {
    cout << ans[i].first << " " << ans[i].second << endl;
  }
  return 0;
}
