#include <bits/stdc++.h>   int main() {     unsigned long long n;     unsigned long long answer;     scanf( %I64u , &n);     if (n < 3) {       printf( %lu , n);       return 0;     }     if (n % 2 == 1) {       answer = (n) * (n - 1) * (n - 2);     } else if (n % 3 != 0) {       answer = n * (n - 1) * (n - 3);     } else {       answer = (n - 1) * (n - 2) * (n - 3);     }     printf( %I64u n , answer);     return 0;   }   