#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  using I = __int128;
  ll n;
  cin >> n;
  vector<I> s{0};
  for (int i = 1; i <= 1000000; i++) {
    s.emplace_back(s.back() + (ll)i * i * i);
  }
  int sz = s.size();
  int l = 0;
  vector<P> ans;
  rep(r, sz) {
    while (s[r] - s[l] > n) l++;
    if (s[r] - s[l] == n) ans.emplace_back(l + 1, r);
  }
  cout << ans.size() << '\n';
  for (auto [l, r] : ans) cout << l << ' ' << r << '\n';
}