diff --git a/day01/input b/day01/input
new file mode 100644
index 0000000..45d03f9
--- /dev/null
+++ b/day01/input
@@ -0,0 +1,2000 @@
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diff --git a/day01/solution.rb b/day01/solution.rb
new file mode 100644
index 0000000..381fa34
--- /dev/null
+++ b/day01/solution.rb
@@ -0,0 +1,12 @@
+#!/bin/env ruby
+
+depths = File.readlines('./input').map(&:to_i)
+
+# Part 1
+changes  = depths.each_cons(2).map { |first, second| second - first}
+pp changes.reject { |num| num.negative?}.count
+
+# Part 2
+sums = depths.each_cons(3).map { |nums| nums.sum }
+changes = sums.each_cons(2).map { |first, second| second - first}
+pp changes.reject { |num| !num.positive?}.count
\ No newline at end of file