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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    long long N; cin >> N;
    long long r = 0,now = 0;
    vector<pair<long long,long long>> answer;
    for(long long l=1; l*l*l<=N; l++){
        while(now < N) now += r*r*r,r++;
        if(now == N) answer.push_back({l,r-1});
        now -= l*l*l;
    }
    cout << answer.size() << "\n";
    for(auto [l,r] : answer) cout << l << " " << r << "\n"; 
}