#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int da[10100]{1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192}; 
int main()
{
     int a;
     cin>>a;
     for(int i=6;i>0;i--)
     { 	
        if(da[i]<=a)
       {
         cout<<da[i]<<endl;
		 return 0; 
       }
     }
}