#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
using ll = long long;

int main(void){
  int n; cin >> n;
  int ans=1;
  n=(n%2?3*n+1:n/2);
  while(n!=1){
    n=(n%2?3*n+1:n/2);
    ans++;
  }
  cout << ans << endl;
  return 0;
}