#include <iostream>
using namespace std;

int func(int n){
    if(n%2==0)
        return n/2;
    else
        return (3*n+1)/2;
}

int main(){
    int n;
    while(cin>>n){
        int iter=0;
        while(n!=1){
            n=func(n);
            iter++;
        }
        cout<<iter<<endl;
    }
}