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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	long long n;
  7. 	cin >> n;
  8. 	if (n <= 3) cout << n;
  9. 	else {
  10. 		long long pow, a = 2, b = 3;
  11. 		pow = log (n) / log (2);
  12. 		a = a << (pow - 1);
  13. 		b = b << (pow - 1);
  14. 		if (a <= n && b <= n) cout << max(a, b);
  15. 		else if(a > n) cout << b ;
  16. 			else cout << a;
  17. 	}
  18. 	return 0;
  19. }
Success #stdin #stdout 0s 15232KB
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https://ideone.com/c0MdVU
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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