diff --git a/README.md b/README.md
index 20be482..77d82dc 100644
--- a/README.md
+++ b/README.md
@@ -467,6 +467,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 3210. Find the Encrypted String                                    | [Link](https://leetcode.com/problems/find-the-encrypted-string/)                                    | [Link](./lib/easy/3210_find_the_encrypted_string.rb)                                    | [Link](./test/easy/test_3210_find_the_encrypted_string.rb)                                    |
 | 3280. Convert Date to Binary                                       | [Link](https://leetcode.com/problems/convert-date-to-binary/)                                       | [Link](./lib/easy/3280_convert_date_to_binary.rb)                                       | [Link](./test/easy/test_3280_convert_date_to_binary.rb)                                       |
 | 3498. Reverse Degree of a String                                   | [Link](https://leetcode.com/problems/reverse-degree-of-a-string/)                                   | [Link](./lib/easy/3498_reverse_degree_of_a_string.rb)                                   | [Link](./test/easy/test_3498_reverse_degree_of_a_string.rb)                                   |
+| 3516. Find Closest Person                                          | [Link](https://leetcode.com/problems/find-closest-person/)                                          | [Link](./lib/easy/3516_find_closest_person.rb)                                          | [Link](./test/easy/test_3516_find_closest_person.rb)                                          |
 
 ### Medium
 
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index bd53e5f..f3bf9e6 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 = '9.3.5.1'
+  s.version = '9.3.6'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'
@@ -14,7 +14,6 @@ require 'English'
   s.authors = ['Artem Fomchenkov']
   s.email = 'artem.fomchenkov@outlook.com'
   s.homepage = 'https://github.com/fartem/leetcode-ruby'
-  s.test_files = s.files.grep(%r{^(test)/})
   s.extra_rdoc_files = ['README.md']
 
   s.add_development_dependency('minitest', '5.18.0')
@@ -22,4 +21,5 @@ require 'English'
   s.add_development_dependency('rake', '12.3.3')
   s.add_development_dependency('rubocop', '1.7.0')
   s.add_development_dependency('simplecov', '0.22.0')
+  s.metadata['rubygems_mfa_required'] = 'true'
 end
diff --git a/lib/easy/3516_find_closest_person.rb b/lib/easy/3516_find_closest_person.rb
new file mode 100644
index 0000000..a6b4f1a
--- /dev/null
+++ b/lib/easy/3516_find_closest_person.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/find-closest-person/
+# @param {Integer} x
+# @param {Integer} y
+# @param {Integer} z
+# @return {Integer}
+def find_closest(x, y, z)
+  return 0 if (z - x).abs == (z - y).abs
+
+  (z - x).abs < (z - y).abs ? 1 : 2
+end
diff --git a/test/easy/test_3516_find_closest_person.rb b/test/easy/test_3516_find_closest_person.rb
new file mode 100644
index 0000000..f5b938a
--- /dev/null
+++ b/test/easy/test_3516_find_closest_person.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/3516_find_closest_person'
+require 'minitest/autorun'
+
+class FindClosestPersonTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      1,
+      find_closest(
+        2, 7, 4
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      2,
+      find_closest(
+        2, 5, 6
+      )
+    )
+  end
+
+  def test_default_three
+    assert_equal(
+      0,
+      find_closest(
+        1, 5, 3
+      )
+    )
+  end
+end