#include<bits/stdc++.h>
using namespace std;
int a[11111111];
int gao(long long x)
{
    if(x==1) return 1;
    if(x<10000000&&a[x]) return a[x];
    int tmp;
    if(x%2==0)
        tmp=gao(x/2)+1;
    else
        tmp=gao(x*3+1)+1;
    if(x<10000000) a[x]=tmp;
    return tmp;
}
int main()
{
    int n;
    cin>>n;
    cout<<gao(n)-1<<endl;
    return 0;
}