#include <cstdio>
#include <map>

 using namespace std;

#define ll long long int
int n;
map<int, ll> mp;

ll solve(int n)
{
    if(n==0)
        return 0;
    if(mp.count(n))
        return mp[n];
    return mp[n]=max((ll)n, (ll)solve(n/2)+(ll)solve(n/3)+(ll)solve(n/4));
}
int main()
{
    mp.clear();
    while(scanf("%d", &n)!=EOF)
        printf("%lld\n", solve(n));
    return 0;
}