#include <bits/stdc++.h>   int main() {     unsigned long long no_of_paths;     unsigned long long no_of_arrangements;     scanf( %I64u , &no_of_paths);     no_of_arrangements = (no_of_paths) * (no_of_paths - 1) / 2 *                          (no_of_paths - 2) / 3 * (no_of_paths - 3) / 4 *                          (no_of_paths - 4) / 5;     no_of_arrangements *= (no_of_paths) * (no_of_paths - 1) * (no_of_paths - 2) *                           (no_of_paths - 3) * (no_of_paths - 4);     printf( %I64u n , no_of_arrangements);     return 0;   }   