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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6.     ios_base::sync_with_stdio(false);
  7.     cin.tie(NULL);
  8.  
  9.     long long n;
  10.     cin >> n;
  11.     long long m = (n - 2) / 2;
  12.     cout << n * m * (m - 1) / 2;
  13. }
Success #stdin #stdout 0.01s 5264KB
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106931798020285376
https://ideone.com/7FohWY
language:
C++14 (gcc 8.3)
created:
20 hours ago
visibility:
secret

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