#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int count = 0;
    while(n!=1){
        if(n%2==0){
            n/=2;
        }else{
            n = (3*n + 1)/2;
        }
        count++;
    }
    cout<<count;
    return 0;
}