#include "bits/stdc++.h"

using namespace std;

#define _CRT_SECURE_NO_WARNINGS
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define ALL(x) (x).begin(), (x).end()
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );

using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using VP = vector<P>;
using VLL = vector<ll>;

const int INF = 2147483647;
const ll MOD = 1e9 + 7;
const ll LINF = 1e9;
const ld EPS = 1e-9;

// int ctoi(const char c) {if ('0' <= c && c <= '9') return (c - '0'); return -1;}

template <class T>
void out(T value, bool nl = true) { cout << value << (nl ? "\n" : ""); }

#pragma region Funcs


#pragma endregion

void solve()
{
    int N;
    cin >> N;

    int A{ 0 };
    double B{ 0 };
    for (int i = 1; i <= N; i++) {
        A += (N % i == 0 ? i : 0);
        B += (N % i == 0 ? ((double)1 / i) : 0);
    }
    out((int)floor(A / B));

}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    std::cout << std::fixed << std::setprecision(15);
    solve();
    return EXIT_SUCCESS;
}