Untitled

import java.util.Scanner;

public class P1 {
	public static int Sol(int n) {
		int maxValue = 0;

		for (int i = 1; i <= Math.sqrt(n); i++) {
			if ((n % i == 0) && (n / i != i) && (n / i % 2 == 1)) {
				maxValue = n / i;
			}
		}
		return maxValue;
	}

//	6 = 1, 2, 3, 6
// 8 = 1,2 ,4,8

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();

		System.out.println(Sol(n));
//		Sol(n);
	}
}