import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		
		int[] a = new int[1000001];
		
		a[1] = s;
		
		loop:
		for(int i = 2; i < 1000001; i++) {
			if(a[i - 1] % 2 == 0) {
				a[i] = a[i - 1] / 2;
			} else {
				a[i] = 3 * a[i - 1] + 1;
			}
			for(int j = 1; j < i; j++) {
				if(a[i] == a[j]) {
					System.out.println(i);
					break loop;
				}
			}	
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		
		int[] a = new int[1000001];
		
		a[1] = s;
		
		loop:
		for(int i = 2; i < 1000001; i++) {
			if(a[i - 1] % 2 == 0) {
				a[i] = a[i - 1] / 2;
			} else {
				a[i] = 3 * a[i - 1] + 1;
			}
			for(int j = 1; j < i; j++) {
				if(a[i] == a[j]) {
					System.out.println(i);
					break loop;
				}
			}	
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		
		int[] a = new int[1000001];
		
		a[1] = s;
		
		loop:
		for(int i = 2; i < 1000001; i++) {
			if(a[i - 1] % 2 == 0) {
				a[i] = a[i - 1] / 2;
			} else {
				a[i] = 3 * a[i - 1] + 1;
			}
			for(int j = 1; j < i; j++) {
				if(a[i] == a[j]) {
					System.out.println(i);
					break loop;
				}
			}	
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		
		int[] a = new int[1000001];
		
		a[1] = s;
		
		loop:
		for(int i = 2; i < 1000001; i++) {
			if(a[i - 1] % 2 == 0) {
				a[i] = a[i - 1] / 2;
			} else {
				a[i] = 3 * a[i - 1] + 1;
			}
			for(int j = 1; j < i; j++) {
				if(a[i] == a[j]) {
					System.out.println(i);
					break loop;
				}
			}	
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int s = sc.nextInt(); s sc.nextInt() sc.nextInt sc int[] a = new int[1000001]; a new int[1000001] 1000001 a[1] = s a[1] a 1 s String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		
		int[] a = new int[1000001];
		
		a[1] = s;
		
		loop:
		for(int i = 2; i < 1000001; i++) {
			if(a[i - 1] % 2 == 0) {
				a[i] = a[i - 1] / 2;
			} else {
				a[i] = 3 * a[i - 1] + 1;
			}
			for(int j = 1; j < i; j++) {
				if(a[i] == a[j]) {
					System.out.println(i);
					break loop;
				}
			}	
		}
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		
		int[] a = new int[1000001];
		
		a[1] = s;
		
		loop:
		for(int i = 2; i < 1000001; i++) {
			if(a[i - 1] % 2 == 0) {
				a[i] = a[i - 1] / 2;
			} else {
				a[i] = 3 * a[i - 1] + 1;
			}
			for(int j = 1; j < i; j++) {
				if(a[i] == a[j]) {
					System.out.println(i);
					break loop;
				}
			}	
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		
		int[] a = new int[1000001];
		
		a[1] = s;
		
		loop:
		for(int i = 2; i < 1000001; i++) {
			if(a[i - 1] % 2 == 0) {
				a[i] = a[i - 1] / 2;
			} else {
				a[i] = 3 * a[i - 1] + 1;
			}
			for(int j = 1; j < i; j++) {
				if(a[i] == a[j]) {
					System.out.println(i);
					break loop;
				}
			}	
		}
	}
}
