#include<iostream>
using namespace std;

int main()
{
    int n;

    while( cin >> n )
    {
        if( n == 0 )
            break;
    
        int sum = 0;
        while( n != 1 )
        {
            if( n % 2 == 0 )
                n /= 2;
            else
                n = n * 3 + 1;
            sum++;
        }
        cout << sum << endl;
    }
    return 0;
}
