#include<iostream> using namespace std; int main(){ long long a,o1,o2,o3,j1,j2,j3; cin>>a; if(a%2==0){ o1=a/2; a=a+1; o2=a-2; o3=a-2; cout<<o1*o2*o3<<endl; } else{ j1=a/2+1; a=a+1; j2=a-2; j3=a-2; cout<<j1*j2*j3<<endl; } return 0; }