
#include <iostream>
using namespace std;

int main() {
  int n,ans=0;
  while(cin >> n) {
    if(n==0)break;
    while(n!=1) {
      if(n%2==0) {
        n /= 2;
      }
      else {
        n = 3*n+1;
      }
      ans++;
    }
    cout << ans << endl;
    ans = 0;
  }
}