diff --git a/README.md b/README.md
index 615a819e..36ad1eeb 100644
--- a/README.md
+++ b/README.md
@@ -714,6 +714,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1685. Sum of Absolute Differences in a Sorted Array                                 | [Link](https://leetcode.com/problems/sum-of-absolute-differences-in-a-sorted-array/)                                 | [Link](./lib/medium/1685_sum_of_absolute_differences_in_a_sorted_array.rb)                                 | [Link](./test/medium/test_1685_sum_of_absolute_differences_in_a_sorted_array.rb)                                 |
 | 1706. Where Will the Ball Fall                                                      | [Link](https://leetcode.com/problems/where-will-the-ball-fall/)                                                      | [Link](./lib/medium/1706_where_will_the_ball_fall.rb)                                                      | [Link](./test/medium/test_1706_where_will_the_ball_fall.rb)                                                      |
 | 1721. Swapping Nodes in a Linked List                                               | [Link](https://leetcode.com/problems/swapping-nodes-in-a-linked-list/)                                               | [Link](./lib/medium/1721_swapping_nodes_in_a_linked_list.rb)                                               | [Link](./test/medium/test_1721_swapping_nodes_in_a_linked_list.rb)                                               |
+| 1780. Check if Number is a Sum of Powers of Three                                   | [Link](https://leetcode.com/problems/check-if-number-is-a-sum-of-powers-of-three/)                                   | [Link](./lib/medium/1780_check_if_number_is_a_sum_of_powers_of_three.rb)                                   | [Link](./test/medium/test_1780_check_if_number_is_a_sum_of_powers_of_three.rb)                                   |
 | 2116. Check if a Parentheses String Can Be Valid                                    | [Link](https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/)                                    | [Link](./lib/medium/2116_check_if_a_parentheses_string_can_be_valid.rb)                                    | [Link](./test/medium/test_2116_check_if_a_parentheses_string_can_be_valid.rb)                                    |
 | 2425. Bitwise XOR of All Pairings                                                   | [Link](https://leetcode.com/problems/bitwise-xor-of-all-pairings/)                                                   | [Link](./lib/medium/2425_bitwise_xor_of_all_pairings.rb)                                                   | [Link](./test/medium/test_2425_bitwise_xor_of_all_pairings.rb)                                                   |
 | 2429. Minimize XOR                                                                  | [Link](https://leetcode.com/problems/minimize-xor/)                                                                  | [Link](./lib/medium/2429_minimize_xor.rb)                                                                  | [Link](./test/medium/test_2429_minimize_xor.rb)                                                                  |
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index a076c652..c7114933 100644
--- a/leetcode-ruby.gemspec
+++ b/leetcode-ruby.gemspec
@@ -5,7 +5,7 @@ require 'English'
 ::Gem::Specification.new do |s|
   s.required_ruby_version = '>= 3.0'
   s.name = 'leetcode-ruby'
-  s.version = '8.8.0'
+  s.version = '8.8.1'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
diff --git a/lib/medium/1780_check_if_number_is_a_sum_of_powers_of_three.rb b/lib/medium/1780_check_if_number_is_a_sum_of_powers_of_three.rb
new file mode 100644
index 00000000..24df4250
--- /dev/null
+++ b/lib/medium/1780_check_if_number_is_a_sum_of_powers_of_three.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/check-if-number-is-a-sum-of-powers-of-three/
+# @param {Integer} n
+# @return {Boolean}
+def check_powers_of_three(n) = !n.to_s(3).include?('2')
diff --git a/test/medium/test_1780_check_if_number_is_a_sum_of_powers_of_three.rb b/test/medium/test_1780_check_if_number_is_a_sum_of_powers_of_three.rb
new file mode 100644
index 00000000..d9890f7e
--- /dev/null
+++ b/test/medium/test_1780_check_if_number_is_a_sum_of_powers_of_three.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1780_check_if_number_is_a_sum_of_powers_of_three'
+require 'minitest/autorun'
+
+class CheckIfNumberIsASumOfPowersThreeTest < ::Minitest::Test
+  def test_default_one = assert(check_powers_of_three(12))
+
+  def test_default_two = assert(check_powers_of_three(91))
+
+  def test_default_three = assert(!check_powers_of_three(21))
+end