#include
#include
int main()
{
int n, p, ts = 0;
scanf("%d", &n);
if (n == 0)
{
printf("0不是正整数");
}
if (n == 1)
{
printf("%d", ts);
}
while ((n > 1) && (n <= 1000))
{
if ((n % 2) == 0)
{
p = n / 2;
}
else
{
p = (3 * n + 1) / 2;
}
n = p;
ts = ts + 1;
}
printf("%d", ts);
}