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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.     ios_base::sync_with_stdio(false);
  6.     cin.tie(NULL);
  7.  
  8.     long long n;
  9.     cin >> n;
  10.    long long ans = (n - 1) * n * (n + 1) / 3;
  11.  
  12.     cout << ans << "\n";
  13.  
  14.     return 0;
  15. }
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/3gdIao
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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