diff --git a/2015/.envrc b/2015/.envrc
new file mode 100644
index 0000000..e24737b
--- /dev/null
+++ b/2015/.envrc
@@ -0,0 +1 @@
+export ADVENT_OF_CODE_SESSION=53616c7465645f5f92dfbc249005a7e94ec3c6e62cd4e5e9ddf8e368a48c0c80440b6c5e37d836cc0b294e19a9e8a7f1
diff --git a/2015/.formatter.exs b/2015/.formatter.exs
new file mode 100644
index 0000000..d2cda26
--- /dev/null
+++ b/2015/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+ inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/2015/.gitignore b/2015/.gitignore
new file mode 100644
index 0000000..c927e54
--- /dev/null
+++ b/2015/.gitignore
@@ -0,0 +1,26 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+advent_of_code_2015-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/
diff --git a/2015/.iex.exs b/2015/.iex.exs
new file mode 100644
index 0000000..795d6b6
--- /dev/null
+++ b/2015/.iex.exs
@@ -0,0 +1 @@
+import AOC.IEx
diff --git a/2015/.tool-versions b/2015/.tool-versions
new file mode 100644
index 0000000..eda65d9
--- /dev/null
+++ b/2015/.tool-versions
@@ -0,0 +1,2 @@
+erlang 24.1.4
+elixir 1.12.3-otp-24
diff --git a/2015/README.md b/2015/README.md
new file mode 100644
index 0000000..337eed7
--- /dev/null
+++ b/2015/README.md
@@ -0,0 +1,20 @@
+# Advent of Code 2015
+
+
+ Setup
+
+ Using [asdf](https://asdf-vm.com/#/):
+
+ ```sh
+ asdf plugin add erlang
+ asdf plugin add elixir
+ asdf install
+ ```
+
+
+| S | M | T | W | T | F | S |
+| :-: | :-: | :-: | :-: | :-: | :-: | :-: |
+| | | 1 | 2 | 3 | 4 | 5 |
+| 6 | 7 | 8 | 9 | 10 | 11 | 12 |
+| 13 | 14 | 15 | 16 | 17 | 18 | 19 |
+| 20 | 21 | 22 | 23 | 24 | 25 | |
diff --git a/2015/config/config.exs b/2015/config/config.exs
new file mode 100644
index 0000000..8a3be87
--- /dev/null
+++ b/2015/config/config.exs
@@ -0,0 +1,8 @@
+import Config
+
+config :nx, :default_defn_options, compiler: EXLA
+
+config :advent_of_code_utils,
+ year: 2015,
+ auto_reload?: true,
+ session: System.get_env("ADVENT_OF_CODE_SESSION")
diff --git a/2015/input/2015_1.txt b/2015/input/2015_1.txt
new file mode 100644
index 0000000..1855a96
--- /dev/null
+++ b/2015/input/2015_1.txt
@@ -0,0 +1 @@
+()()(()()()(()()((()((()))((()((((()()((((()))()((((())(((((((()(((((((((()(((())(()()(()((()()(()(())(()((((()((()()()((((())((((((()(()(((()())(()((((()))())(())(()(()()))))))))((((((((((((()())()())())(())))(((()()()((((()(((()(()(()()(()(()()(()(((((((())(())(())())))((()())()((((()()((()))(((()()()())))(())))((((())(((()())(())(()))(()((((()())))())((()(())(((()((((()((()(())())))((()))()()(()(()))))((((((((()())((((()()((((()(()())(((((()(()())()))())(((()))()(()(()(()((((()(())(()))(((((()()(()()()(()(((())())(((()()(()()))(((()()(((())())(()(())())()()(())()()()((()(((()(())((()()((())()))((()()))((()()())((((()(()()(()(((()))()(()))))((()(((()()()))(()(((())()(()((()())(()(()()(()())(())()(((()(()())()((((()((()))))())()))((()()()()(())()())()()()((((()))))(()(((()()(((((((())()))()((((()((())()(()())(())()))(()(()())(((((((())))(((()))())))))()))())((())(()()((())()())()))))()((()()())(())((())((((()())())()()()(((()))())))()()))())(()()()(()((((((()()))())()))()(((()(((())((((()()()(()))())()()))))())()))())((())()())(((((())())((())())))(((())(((())(((((()(((((())(()(()())())(()(())(()))(()((((()))())()))))())))((()(()))))())))(((((())()))())()))))()))))(((()))()))))((()))((()((()(()(())()())))(()()()(())()))()((((())))))))(())(()((()()))(()))(()))(()((()))))))()()((((()()))()())()))))))()()()))(()((())(()))((()()()())()(((()((((())())))()((((()(()))))))())))()()())()))(()))))(()())()))))))((())))))))())()))()((())())))(()((()))()))(())))))(()))()())()()))((()(()))()()()()))))())()()))())(())()()))()))((()))))()()(()())))))()()()))((((()))()))))(()(())))(()())))((())())(()))()))))()())))()())()())))))))))()()))))())))((())((()))))())))(((()())))))))(()))()()))(()))()))))()())))))())((((()())))))))())))()()))))))))()))()))))()))))))(())))))))))())))))))))))))))())())((())))))))))()))((())))()))))))))())()(()))))))())))))()()()())()(()()()(()())(()))()()()(()())))())())))()))))())))))))()()()()())(())())()())()))))(()()()()()))))()))())())))((()())()())))()))()))))(()())))()))))))))(((()))()()))))))))))))))))))))(()))(()((()))())))())(()))(()(()(())))))()(()))()))()()))))))))))))()((()())(())())()(())))))())()())((()()))))(()()))))())()(())()))))))))))))))))))))()))(()(()())))))))()()((()))()))))))((())))()))))))))((()))())()()))())()()))((()))())))))))))))(()())()))(())((()(()()))(()())(())))()())(()(())()()))))()))()(()))))))(()))))))))))(()))())))))))))())))))())))(())))))()))))(())())))))))))()(()))))()())))())(()))()())))))))))))))())()()))))()))))))())))))()))))(())(()()()()((())()))())(()))((())()))())())(())(()()))))()))(())()()((())(())))(())))()))())))))))))()(((((())())))(())()))))(())))((()))()(((((((()))))()()))(())))))()(()))))(()()))()))())))))))(()())()))))))))())))(()))())()))(())()((())())()())())(()(()))))()))))))((()())(())()()(()())))()()))(())(())(()))())))()))(()))()()))((((()))))()))((()()()))))()))()))())))(()))()))))(())))()))())()(()))()())))())))))))())))())))()()))))))(()))())())))()))()()())())))))))))))))())))()))(()()))))())))())()(())))())))))))))))))))))()()())())))))()()()((()(()))()()(())()())()))()))))()()()))))))((()))))))))()(()(()((((((()()((()())))))))))))()))())))))((())())(()))())))())))))())()()())(())))())))()())())(())))))))()()(())))()))())))())())())()))))))))()))(()()()())())())))(())())))))))()()())()))))())))())()(())())))))))()())()))(()()(())())))()(()((()()((()()(((((())(()())()))(())()))(())))(())))))))()))()))((()))()))()))))))))()))))))))((()()())(()))(((()))(())))()))((())(((())))()())))())))))((())))))(())())((((((())())()(()))()(()((()())))((())()(()(()))))(())(()()())(())))())((()(((())())))(((()())())))())()(())())((((()()))))())((()))()()()()(())(((((((()()()((()))())(()())))(())())((((()()(()))))()((())))((())()))()(((()))())))()))((()(()))(())(()((((())((((()()(()()))(((())(()))))((((()(()))(())))))((()))(()))((()(((()(()))(()(()((()(())(()(()(()(()()((()))())(((())(()(()))))(()))()()))(())))(())()(((())(()))()((((()()))))())(()))))((())()((((()(((()))())())(((()))()())((())(())())(())()(())()(()()((((((()()))))()()(((()()))))()())()(((()(()))(()(()())(()(()))))(((((()(((())())))))(((((()((()()((())())((((((()(())(()()((()()()()()()()(()()))()(((()))()))(((((((())(((()((()())()((((())(((()(())))()((()(()()()((())((()())()))()))())))())((((((()))(()(()()()))(()((()(()(()))()((()(((()()()((())(((((())()(()))())())((()(())))(()(()())(())((())())())(((()()()(())))))())(()))))))()))))))())((()()()))((()((((((()))(((()((((()()()(((()))())()(()()(((()((()()()()())()()))()()()(()(())((()))))(()))())))))))()(()()(((((())()(()(((((()((()(()()())(()((((((((()((((((())()((((()()()((()((()((((((()))((())))))))())()))((()(()))()(()()(()((())((()()((((((((((((()())(()()()))((((()((((((())(()))())(()()((()()))()(((((((()((()()((((((()(((())))((())))((((((((()()(((((((())(((((()())(((())((())()((((()(((((((()(()(((()((((((()(((()(((((((((((()()((()()(()))((()()(((()(((())))((((())()(()(((())()(()(((())(((((((((((()))())))((((((())((()()((((()())())(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\ No newline at end of file
diff --git a/2015/input/2015_2.txt b/2015/input/2015_2.txt
new file mode 100644
index 0000000..5f3335f
--- /dev/null
+++ b/2015/input/2015_2.txt
@@ -0,0 +1,1000 @@
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diff --git a/2015/input/2015_3.txt b/2015/input/2015_3.txt
new file mode 100644
index 0000000..783e28b
--- /dev/null
+++ b/2015/input/2015_3.txt
@@ -0,0 +1 @@
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