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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6.     cin>>n;
  7.     long long p= 1;
  8.     for (int i = 2; i <=n; i+=2) {
  9.         p*= i;
  10.     }
  11.     cout <<p;
  12. 	return 0;
  13. }
Success #stdin #stdout 0.01s 5332KB
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https://ideone.com/oYn7kT
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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