import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

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

		Set<Integer> set = new HashSet<>();
		set.add(n);
		for (int i = 0; ; i++) {
			if (n % 2 == 0) {
				n /= 2;
			} else {
				n = 3 * n + 1;
			}
			if (n == 1) {
				System.out.println(i + 1);
				return;
			}
			if (!set.add(n)) {
				System.out.println("infinity");
				return;
			}
		}
	}
}