#include <cstdio>
#include <iostream>
#include <vector>
#include <map>
#include <unordered_map>
#include <set>
#include <string>
#include <cstring>
#include <sstream>
#include <algorithm>
#include <functional>
#include <queue>
#include <stack>
#include <cmath>
#include <iomanip>
#include <list>
#include <tuple>
#include <bitset>
#include <ciso646>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> T;
typedef vector<ll> vec;

inline bool cheak(ll x, ll y, ll xMax, ll yMax){ return x >= 0 && y >= 0 && xMax > x && yMax > y; }
inline ll toInt(string s) { ll v; istringstream sin(s); sin >> v; return v; }
template<class T> inline string toString(T x) { ostringstream sout; sout << x; return sout.str(); }
template<class T> inline T sqr(T x) { return x*x; }

#define For(i,a,b)	for(ll (i) = (a);i < (b);(i)++)
#define rep(i,n)	For(i,0,n)
#define rFor(i,a,b)	for(ll (i) = (a-1);i >= (b);(i)--)
#define rrep(i,n)	rFor(i,n,0)
#define clr(a)		memset((a), 0 ,sizeof(a))
#define mclr(a)		memset((a), -1 ,sizeof(a))
#define all(a)		(a).begin(),(a).end()
#define sz(a)		(sizeof(a))

const ll mod = 1e9 + 7;
const ll INF = 1e9 + 9;

ll gcd(ll a, ll b){ return b ? gcd(b, a%b) : a; }
ll lcm(ll a, ll b){ return a / gcd(a, b) * b; }

int main()
{
	ll n, x;
	cin >> n;
	
	ll sum1 = (n + 1) / 2;
	ll sum2 = (n + 3) / 2;
	ll ma = 0;
	if (n % 2){
		ma = max(gcd(sum1, sum2), n);
	}
	else{
		ma = max(gcd(n + 1, n + 3),n/2);
	}

	set<ll> se;
	for (int i = 1; i <= sqrt(ma) + 1; i++){
		if (ma % i == 0){
			se.insert(ma / i);
			se.insert(i);
		}
	}
	ll ans = 0;
	for (auto i : se){
		ans += i;
	}

	cout << ans << endl;

	return 0;
}