#include<bits/stdc++.h>
#define loop(i,a,b) for(int i=a;i<b;i++)
#define rep(i,a) loop(i,0,a)
using namespace std;

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