diff --git a/day_03/1.rb b/day_03/1.rb
index bd16fdb..4f5fcb8 100755
--- a/day_03/1.rb
+++ b/day_03/1.rb
@@ -7,8 +7,8 @@ class Main
 
     $stdin.each_line do |line|
       nums = line.chomp.each_char.map(&:to_i)
-      first_digit = nums[0..-2].sort.reverse[0]
-      second_digit = nums[nums.find_index(first_digit) + 1..].sort.reverse[0]
+      first_digit = nums[0..-2].max
+      second_digit = nums[nums.find_index(first_digit) + 1..].max
       @sum += "#{first_digit}#{second_digit}".to_i
     end