#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#include <atcoder/all>
#define all(v) v.begin(),v.end()
#define mp(a,b) make_pair(a,b)
#define eb(v) emplace_back(v)
#define fast cin.tie(nullptr);ios_base::sync_with_stdio(false)
using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint998244353;
//using mint = modint1000000007;
using ld = long double;
using graph = vector<vector<int>>;
constexpr ll mod = 998244353;
//constexpr ll mod = 1e9 + 7;
constexpr ll inf = 1e18;

ll n;
int main() {
	fast;
	cin >> n;
	for (int i = 60; i >= 0; i--) {
		ll bit = (1ll << i);
		if (n & bit) {
			cout <<  bit;
			return 0;
		}
	}
}