import java.io.BufferedOutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static PrintWriter out;

    public static void main(String[] args) {
        Main.run();
    }

    private static void run() {
        out = new PrintWriter(new BufferedOutputStream(System.out));
        Scanner sc = new Scanner(System.in);
        int s = Integer.parseInt(sc.next());
        ArrayList<Integer> list = new ArrayList<>();
        list.add(s);
        for (int i = 1, answer = 0;; i++) {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        }
        out.close();
        sc.close();
    }

    private static int calcF(int pnum) {
        int n = pnum;
        if (n % 2 == 0) {
            return n / 2;
        } else {
            return 3 * n + 1;
        }
    }
} import java.io.BufferedOutputStream; BufferedOutputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.ArrayList; ArrayList java.util import java.util.Scanner; Scanner java.util public class Main {
    public static PrintWriter out;

    public static void main(String[] args) {
        Main.run();
    }

    private static void run() {
        out = new PrintWriter(new BufferedOutputStream(System.out));
        Scanner sc = new Scanner(System.in);
        int s = Integer.parseInt(sc.next());
        ArrayList<Integer> list = new ArrayList<>();
        list.add(s);
        for (int i = 1, answer = 0;; i++) {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        }
        out.close();
        sc.close();
    }

    private static int calcF(int pnum) {
        int n = pnum;
        if (n % 2 == 0) {
            return n / 2;
        } else {
            return 3 * n + 1;
        }
    }
} Main public static PrintWriter out; out public static void main(String[] args) {
        Main.run();
    } main {
        Main.run();
    } Main.run() Main.run Main String[] args args private static void run() {
        out = new PrintWriter(new BufferedOutputStream(System.out));
        Scanner sc = new Scanner(System.in);
        int s = Integer.parseInt(sc.next());
        ArrayList<Integer> list = new ArrayList<>();
        list.add(s);
        for (int i = 1, answer = 0;; i++) {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        }
        out.close();
        sc.close();
    } run {
        out = new PrintWriter(new BufferedOutputStream(System.out));
        Scanner sc = new Scanner(System.in);
        int s = Integer.parseInt(sc.next());
        ArrayList<Integer> list = new ArrayList<>();
        list.add(s);
        for (int i = 1, answer = 0;; i++) {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        }
        out.close();
        sc.close();
    } out = new PrintWriter(new BufferedOutputStream(System.out)) out new PrintWriter(new BufferedOutputStream(System.out)) Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int s = Integer.parseInt(sc.next()); s Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc ArrayList<Integer> list = new ArrayList<>(); list new ArrayList<>() list.add(s) list.add list s for (int i = 1, answer = 0;; i++) {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        } int i = 1, answer = 0; int i = 1 i 1 answer = 0; answer 0 i++ i++ i {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        } {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        } answer = Main.calcF(list.get(i - 1)) answer Main.calcF(list.get(i - 1)) Main.calcF Main list.get(i - 1) list.get list i - 1 i 1 if (list.contains(answer)) {
                out.println(i + 1);
                break;
            } list.contains(answer) list.contains list answer {
                out.println(i + 1);
                break;
            } out.println(i + 1) out.println out i + 1 i 1 break; list.add(answer) list.add list answer out.close() out.close out sc.close() sc.close sc private static int calcF(int pnum) {
        int n = pnum;
        if (n % 2 == 0) {
            return n / 2;
        } else {
            return 3 * n + 1;
        }
    } calcF {
        int n = pnum;
        if (n % 2 == 0) {
            return n / 2;
        } else {
            return 3 * n + 1;
        }
    } int n = pnum; n pnum if (n % 2 == 0) {
            return n / 2;
        } else {
            return 3 * n + 1;
        } n % 2 == 0 n % 2 n 2 0 {
            return n / 2;
        } return n / 2; n / 2 n 2 {
            return 3 * n + 1;
        } return 3 * n + 1; 3 * n + 1 3 * n 3 n 1 int pnum pnum public class Main {
    public static PrintWriter out;

    public static void main(String[] args) {
        Main.run();
    }

    private static void run() {
        out = new PrintWriter(new BufferedOutputStream(System.out));
        Scanner sc = new Scanner(System.in);
        int s = Integer.parseInt(sc.next());
        ArrayList<Integer> list = new ArrayList<>();
        list.add(s);
        for (int i = 1, answer = 0;; i++) {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        }
        out.close();
        sc.close();
    }

    private static int calcF(int pnum) {
        int n = pnum;
        if (n % 2 == 0) {
            return n / 2;
        } else {
            return 3 * n + 1;
        }
    }
} public class Main {
    public static PrintWriter out;

    public static void main(String[] args) {
        Main.run();
    }

    private static void run() {
        out = new PrintWriter(new BufferedOutputStream(System.out));
        Scanner sc = new Scanner(System.in);
        int s = Integer.parseInt(sc.next());
        ArrayList<Integer> list = new ArrayList<>();
        list.add(s);
        for (int i = 1, answer = 0;; i++) {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        }
        out.close();
        sc.close();
    }

    private static int calcF(int pnum) {
        int n = pnum;
        if (n % 2 == 0) {
            return n / 2;
        } else {
            return 3 * n + 1;
        }
    }
} Main
import java.io.BufferedOutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static PrintWriter out;

    public static void main(String[] args) {
        Main.run();
    }

    private static void run() {
        out = new PrintWriter(new BufferedOutputStream(System.out));
        Scanner sc = new Scanner(System.in);
        int s = Integer.parseInt(sc.next());
        ArrayList<Integer> list = new ArrayList<>();
        list.add(s);
        for (int i = 1, answer = 0;; i++) {
            answer = Main.calcF(list.get(i - 1));
            if (list.contains(answer)) {
                out.println(i + 1);
                break;
            }
            list.add(answer);
        }
        out.close();
        sc.close();
    }

    private static int calcF(int pnum) {
        int n = pnum;
        if (n % 2 == 0) {
            return n / 2;
        } else {
            return 3 * n + 1;
        }
    }
}
