C++ :

#include<cstdio>
#include<cstring>
#include<cmath>
#include<iostream>
#include<algorithm>
using namespace std;

int main()
{
   long long  n;
    while(cin>>n)
    {
         long long ans;
            if(n<3)
            cout<<n<<endl;
        else   if(n%2==0&&n%6!=0)
        {
            ans=n*(n-1)*(n-3);
            cout<<ans<<endl;
        }

        else    if(n%6==0)
        {
        ans=(n-2)*(n-1)*(n-3);
            cout<<ans<<endl;
        }

        else if(n%2!=0)
        {
            ans=n*(n-1)*(n-2);
        cout<<ans<<endl;
        }
    }

        return 0;
}