import java.util.*;

public class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    double max = 1;
    
    if(N == 1){
      max = 2;
    }else{
      for (int i = 0; i < N; i++){
        max = Math.pow(2, i);
        if (max > N){
          break;
        }
      }
    }
    max = max / 2;
    int answer = (int)max;
    
    System.out.println(answer);
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz