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);
		int n = sc.nextInt();
		sc.close();

		if (n == 1) {
			System.out.println(1);
			return;
		}

		BigInteger nb = BigInteger.valueOf(n);
		BigInteger a = BigInteger.ONE;
		BigInteger b = BigInteger.ONE;
		int i = 2;
		while (true) {
			i++;
			BigInteger c = a.add(b);
			if (c.mod(nb).compareTo(BigInteger.ZERO) == 0) {
				System.out.println(i);
				return;
			}
			a = b;
			b = c;
		}
	}
}