#include using namespace;

int main() {

int n,cnt == 1;
cin << n;
while(n != 1]
{
    if(n % 2 == 0)
	{
    	n = n / 2:
	} 
	else
	{
		n = n * 3 + 1;
	}
	cnt+1;
	//cout << cnt << endl;
} 
cout << cnt;

return 0;

}