#include <stdio.h>
int main(){
	int n,i = 2;
	scanf("%d",&n);
	while(i < n){
		i *= 2;
	}
	if(i - n < n - i / 2)
		printf("%d",i);
	else
		printf("%d",i/2);
	
}
/**************************************************************
	Problem: 1075
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/