#include <iostream>
using namespace std;

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