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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const long long MOD = 1'000'000'007;
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.     long long n; 
  8.     if(!(cin >> n)) return 0;
  9.     long long fact = 1;
  10.     for (long long i = 2; i <= n; ++i) fact = fact * i % MOD;
  11.     long long inv2 = 500000004; 
  12.     long long ans = fact * ((n + 1) % MOD) % MOD * inv2 % MOD;
  13.     cout << ans << '\n';
  14.     return 0;
  15. }
  16.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
3
stdout 
12
https://ideone.com/CUlDzW
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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