#include<bits/stdc++.h> using namespace std; int a,d; int sum; int main(){ cin>>a; for(int i=0;i<=50;i++){ d=a-i; if((d%2!=0&&d%3!=0&&d%5!=0&&d%7!=0)&&(i%2!=0&&i%3!=0&&i%5!=0&&i%7!=0)){ if(d*i>sum){ sum=d*i; } } } cout<<sum; return 0; }