#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,i=1;
    cin>>n;
    while(i<n){
        i*=2;
    }
    i/=2;
    if(i*2-n<n-i){
        cout<<i*2;
    }else{
        cout<<i;
    }
}
/**************************************************************
	Problem: 1075
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/