#include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for (int i = 0; i < (n); ++i)
template<class T> inline bool chmin(T& a, T b) {if (a > b) {a = b;return true;}return false;}
template<class T> inline bool chmax(T& a, T b) {if (a < b) {a = b;return true;}return false;}
using ll = long long;
using P = pair<int,int>;
using Pl = pair<long long,long long>;
using veci = vector<int>;
using vecl = vector<long long>;
using vecveci = vector<vector<int>>;
using vecvecl = vector<vector<long long>>;
const int MOD = 1000000007;
const double pi = acos(-1);
ll gcd(ll a, ll b) {if(b == 0) return a; else return gcd(b,a%b);}
ll lcm(ll a, ll b) {return a*b/gcd(a,b);}

string d(ll n) {
    string ans = "";
    while(n) {
        ans += n%2 + '0';
        n /= 2;
    }
    return ans;
}

ll f(string S) {
    ll ans = 0;
    ll q = 1;
    REP(i,S.size()) {
        if(S[i] == '1') ans += q;
        q *= 2;
    }
    return ans;
}

ll pow(int a, int n) {
    ll ans = 1;
    REP(i,n) ans *= a;
    return ans;
}

int main() {
    ll N; cin >> N;
    int S = d(N).size();
    //cout << S << endl;
    cout << (1LL<<(S-1)) << endl;
    return 0;
}