#include #include

using namespace std;

int main() { int n; while (scanf("%d", &n) != EOF) { int k = 0; while (n != 1) { if (n % 2 == 1) { n = (3 * n + 1) / 2; k++; } else { n = n / 2; k++; } } printf("%d\n", k); } return 0; }