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

ll cube_sum(ll x){
    return x * (x + 1) / 2 * x * (x + 1) / 2;
}

int main() {
    ll n;
    cin >> n;
    assert(1 <= n && n <= 1000000000000000000);

    ll l = 1, r = 1;
    vector<pair<ll, ll>> ans;
    while (r * r * r <= n){
        ll t = cube_sum(r) - cube_sum(l - 1);
        if (t == n){
            ans.push_back({l, r});
        }
        if (t <= n) r++;
        else l++;
    }
    cout << ans.size() << endl;
    for (auto [x, y] : ans) cout << x << " " << y << endl;
}