#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';
signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cout.setf(ios::fixed); cout.precision(20); 
    #endif

    int w;
    cin >> w;

    auto f = [&] (int n, int k) {
        int ans = 0;
        for (int i = 0; i < k && n; ++i) {
            ans += n;
            n >>= 1;
        }   
        return ans;
    };  

    int ans = w;
    for (int len = 1; len <= 100; ++len) {
        int l = 0;
        int r = w;
        while (l < r - 1) {
            int m = (l + r) >> 1;
            if (f(m, len) < w)
                l = m;
            else
                r = m;
        }   
        if (f(r, len) == w) {
            ans = min(ans, r);
        }
    }   
    cout << ans << endl;
}