#include<stdio.h>  
int main()  
{  
    int n;  
    scanf("%d", &n);  
    int c = 0;
    while (n != 1)  
    {  
        if (n % 2 == 1)  
        {  
            int sum = n * 3 + 1;  
            //printf("%d*3+1=%d\n", n,sum);  
            c++;
            n = sum;  
        }  
        else  
        {  
            int div = n / 2;  
            //printf("%d/2=%d\n", n, div);  
            c++;
            n = div;  
        }  
    }  
    
    printf("%d\n", c);  
    return 0;  
  
}  
/**************************************************************
	Problem: 1241
	User: admin
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:1144 kb
****************************************************************/