#include<bits/stdc++.h>
using namespace std;

int main()
{
  int n;
  while( cin >> n, n ) {
    int cnt = 0;

    while( n != 1 ) {
      if( n % 2 == 0 ) n /= 2;
      else n = n * 3 + 1;
      cnt++;
    }

    cout << cnt << endl;

  }

}