#include <iostream>
using namespace std;
  
 
int main() {
    long n;
    cin >> n;
      
    if (n == 1) {
        cout << 1;
    } else if (n == 2) {
    	cout << 2;	
    } else {
        cout << n * (n - 1) * (n - 2);
    }    
      
    return 0;
}