#include <bits/stdc++.h>

#define rep(i, n) for(int i = 0; i < n; i++)
using namespace std;

typedef long long ll;

const int INF = 1 << 30;
const ll LLINF = 1LL << 62;

int mod = 1000000007;

int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll D; cin >> D;
    ll ans = LLINF;
    for(int jmp = 0; jmp <= 60; jmp++){
        ll ok = D, ng = -1;
        ll m = (ok+ng)/2;
        while(abs(ok-ng) > 1){
            ll temp = m;
            ll res = m;
            int cnt = 0;
            while(temp > 0 && cnt < jmp){
                res += temp/2;
                temp >>= 1;
                cnt++;
            }
            if(res >= D) ok = m;
            else ng = m;
            m = (ok+ng)/2;
        }
        ll dlim = ok;
        
        for(ll i = dlim; i <= dlim; i++){
            ll acc = i;
            ll temp = i;
            int cnt = 0;
            while(temp > 0 && cnt < jmp){
                acc += temp/2;
                temp >>= 1;
                cnt++;
            }
            if(acc == D) ans = min(ans, i);
        }
    }
    cout << ans << endl;
    return 0;
}