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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n;
  7. 	cin >> n;
  8. 	int len = 0;
  9. 	int ans = 0;
  10. 	while (n) {
  11. 		if (n % 10 == 7)
  12. 			ans += (1 << len);
  13. 		n /= 10;
  14. 		len++;
  15. 	}
  16. 	for (int i = 1; i < len; i++)
  17. 		ans += (1 << i);
  18. 	cout << ans + 1 << endl;
  19. 	return 0;
  20. }
Success #stdin #stdout 0s 3144KB
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https://ideone.com/j6Gamw
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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