#include <iostream>
using namespace std;

int main() {
    int n,i;
    cin>>n;
    for(i =0;n!=1;++i){
        if(n%2==0){
            n=n/2;
        }
        else{
            n=(n*3+1)/2;
        }
    }
    
    std::cout<<i<<std::endl;
}