#include <iostream>
#include <cstring>
#include <algorithm>

using namespace std;

int main()
{
   long long  n;
    cin>>n;
    long long ma = n;
    for(int i = 1;i<=n;i++)
    {
        long long x = i;
         while(x!=1)
     {

        if(x%2==0) x=x/2;
        else x= x*3+1;
        ma = max(ma,x);
        }
    }

    cout<<ma;
}