import java.math.BigInteger;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		BigInteger n = sc.nextBigInteger();
		sc.close();

		BigInteger b0 = BigInteger.ZERO;
		BigInteger b1 = BigInteger.ONE;
		BigInteger b2 = BigInteger.valueOf(2);
		BigInteger b3 = BigInteger.valueOf(3);
		BigInteger b4 = BigInteger.valueOf(4);
		BigInteger b8 = BigInteger.valueOf(8);
		if (n.remainder(b2).compareTo(b1) == 0) {
			if (n.compareTo(b3) >= 0) {
				System.out.println(1);
			} else {
				System.out.println(-1);
			}
		} else {
			if (n.remainder(b4).compareTo(b0) == 0 &&
					n.compareTo(b8) >= 0) {
				System.out.println(1);
			} else {
				System.out.println(-1);
			}
		}
	}
}