#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = (a >= b ? a : b)
#define chmin(a, b) a = (a <= b ? a : b)
#define out(a) cout << a << endl
#define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)
#define abs(x) (x >= 0 ? x : -(x))

// 約数の列挙 O(√n)
template <typename T>
vector<T> all_divisor_catch(T n) {
    vector<T> res;
    for (T i = 1; i * i <= n; i++) {
        if (n % i == 0) {
            res.push_back(i);
            if (i != n - i) res.push_back(n / i);
        }
    }
    return res;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll n;
    cin >> n;
    auto v = all_divisor_catch(n);
    out(SZ(v) / 2 * 2); // 64に対して8 8だったら、1種類のみ 約数の個数奇数なら1減らす
    
}