#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<iostream>
#include<cstdint>
#include<cstddef>
#include<vector>
//#include<atcoder/all>
//using namespace atcoder;
using namespace std;
using i32 = int_fast32_t;
using i64 = int_fast64_t;
using usize = size_t;
using u32 = uint_fast32_t;
using u64 = uint_fast64_t;
using i128 = __int128_t;
using u128 = __uint128_t;
using ld = long double;
template<typename T>
using vec = vector<T>;
#define rep(i, n) for (i64 i = 0; i < (i64)(n); ++i)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
#define len(hoge) (i64)((hoge).size())
using P = pair<i64,i64>;
template<class T, class S> ostream &operator<<(ostream &os, const pair<T,S> &p){
	os << p.first << " " << p.second;
	return os;
}
void solve(){
}
int main(){
	ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	i64 n;
	cin >> n;
	i64 cnt = 0;
	while(n){
		cnt++;
		n /= 2;
	}
	cnt--;
	if(cnt == 0)cout << 1 << endl;
	else {
		i64 ans = 1;
		while(cnt--)ans*=2;
		cout << ans << endl;
	}
}