#include <cstdio>
#include <iostream>
using namespace std;

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