#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,i=0;
cin>>n;
while(n!=1){
    if(n%2==0){
        n/=2;
    } else{
        n=n*3+1;
    }
    i++;
}
cout<<i;
}
/**************************************************************
	Problem: 1241
	User: linzihang
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/