diff --git a/2017/ruby/day_01.rb b/2017/ruby/day_01.rb
new file mode 100644
index 0000000..b353d8d
--- /dev/null
+++ b/2017/ruby/day_01.rb
@@ -0,0 +1,5 @@
+# p ARGF.read.strip.chars.map(&:to_i).each_cons(2).select {|a,b| a == b }.map(&:first).sum
+
+a = ARGF.read.strip.chars.map(&:to_i)
+b = a.rotate(a.size/2)
+p a.zip(b).select {|a,b| a == b }.map(&:first).sum