#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>
#include <iomanip>
#include <limits>
#include <chrono>
#include <random>
#include <array>
#include <unordered_map>
#include <functional>
#include <complex>
#include <numeric>
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; }
//constexpr long long MAX = 5100000;
constexpr long long INF = 1LL << 60;
constexpr int inf = 1000000007;
constexpr long long mod = 1000000007LL;
//constexpr long long mod = 998244353LL;
const long double PI = acos((long double)(-1));

using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;

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


int main()
{
    /*
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    */

	ll n; scanf("%lld", &n);
	ll res = 0;
	vector<ll> d; if (n & 1) d = enumdiv(n); else d = enumdiv(n / 2);
	for (auto e : d) res += e;
	cout << res << endl;
    return 0;
}