Update README.md

Author: kamyu104

README.md

@@ -676,7 +676,7 @@
 0170| [Two Sum III - Data structure design](https://leetcode.com/problems/two-sum-iii-data-structure-design/) | [C++](./C++/two-sum-iii-data-structure-design.cpp) [Python](./Python/two-sum-iii-data-structure-design.py) | _O(n)_ | _O(n)_ | Easy | 🔒 |
 0187| [Repeated DNA Sequences](https://leetcode.com/problems/repeated-dna-sequences/) | [Python](./Python/repeated-dna-sequences.py) | _O(n)_       | _O(n)_          | Medium         ||
 0202| [Happy Number](https://leetcode.com/problems/happy-number/)      | [C++](./C++/happy-number.cpp) [Python](./Python/happy-number.py)   | _O(k)_  | _O(k)_          | Easy          ||
-0204| [Count Primes](https://leetcode.com/problems/count-primes/)  | [C++](./C++/count-primes.cpp) [Python](./Python/count-primes.py) | _O(n)_        | _O(n)_          | Easy           ||
+0204| [Count Primes](https://leetcode.com/problems/count-primes/)  | [C++](./C++/count-primes.cpp) [Python](./Python/count-primes.py) | _O(nlog(logn))_        | _O(n)_          | Easy           ||
 0205| [Isomorphic Strings](https://leetcode.com/problems/isomorphic-strings/) | [C++](./C++/isomorphic-strings.cpp) [Python](./Python/isomorphic-strings.py) | _O(n)_ | _O(1)_       | Easy           || 
 0217| [Contains Duplicate](https://leetcode.com/problems/contains-duplicate/)  | [C++](./C++/contains-duplicate.cpp) [Python](./Python/contains-duplicate.py) | _O(n)_        | _O(n)_          | Easy           ||
 0219| [Contains Duplicate II](https://leetcode.com/problems/contains-duplicate-ii/)  | [C++](./C++/contains-duplicate-ii.cpp) [Python](./Python/contains-duplicate-ii.py) | _O(n)_        | _O(n)_          | Easy           ||