diff --git a/day_15.rb b/day_15.rb
new file mode 100644
index 0000000..4331ba0
--- /dev/null
+++ b/day_15.rb
@@ -0,0 +1,27 @@
+regex = /(\w+): capacity (-?\d+), durability (\d+), flavor (-?\d+), texture (-?\d+), calories (\d+)/
+ingredients = Hash[DATA.read.scan(regex).map {|name, *attrs| [name, attrs.map(&:to_i)] }]
+# ingredients = {"Butterscotch" => [-1, -2, 6, 3, 8],
+#                "Cinnamon" => [2, 3, -2, -1, 3]}
+max = 0
+(0..100).each do |i|
+  (0..100-i).each do |j|
+    (0..100-i-j).each do |k|
+      l = 100-i-j-k
+      a = [i,j,k,l]
+      s = (0..3).map {|s|
+        ingredients.values.map {|x| x[s] }.zip(a).map {|x,y| x*y }.inject(:+)
+      }.map {|s|
+        [s,0].max
+      }.inject(:*)
+      if s > max && 
+        max = s
+        p a, s
+      end
+    end
+  end
+end
+__END__
+Sugar: capacity 3, durability 0, flavor 0, texture -3, calories 2
+Sprinkles: capacity -3, durability 3, flavor 0, texture 0, calories 9
+Candy: capacity -1, durability 0, flavor 4, texture 0, calories 1
+Chocolate: capacity 0, durability 0, flavor -2, texture 2, calories 8