#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define printVec(v) printf("{"); for (const auto& i : v) { std::cout << i << ", "; } printf("}\n");
#define degreeToRadian(deg) (((deg)/360)*2*M_PI)
#define radianTodegree(rad) (((rad)/2/M_PI)*360)
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
using namespace std;
using P = pair<int,int>;
using ll = long long;
const ll INF = 1LL<<60;
const int MOD = 1e9 + 7;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

vector<ll> enum_divisors(ll n) {
    vector<ll> res;
    for (ll i = 1; i * i <= n; ++i) {
        if (n % i == 0) {
            res.push_back(i);
            if (n / i != i) res.push_back(n / i);
        }
    }
    sort(res.begin(), res.end());
    return res;
}


//cin.tie(0);ios::sync_with_stdio(false);
//cout << fixed << setprecision(15) << y << endl;
int main() {
  ll n;
  cin >> n;

  ll ans = 0;
  for (auto v : enum_divisors(n)) ans += v;
  cout << ans << endl;
  return 0;
}