diff --git a/d18.sh b/d18.sh
new file mode 100755
index 0000000..405fb5d
--- /dev/null
+++ b/d18.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+# I can't be assed to write a tokenizer so I patched GNU bc
+# Source archive: https://ftp.gnu.org/gnu/bc/bc-1.07.1.tar.gz
+
+patch_p1="
+--- bc-1.07.1.orig/bc/bc.y
++++ bc-1.07.1/bc/bc.y
+@@ -112,8 +112,7 @@
+ %nonassoc NOT
+ %left REL_OP
+ %right ASSIGN_OP
+-%left '+' '-'
+-%left '*' '/' '%'
++%left '+' '-' '*' '/' '%'
+ %right '^'
+ %nonassoc UNARY_MINUS
+ %nonassoc INCR_DECR
+"
+
+patch_p2="
+--- bc-1.07.1.orig/bc/bc.y
++++ bc-1.07.1/bc/bc.y
+@@ -112,8 +112,8 @@
+ %nonassoc NOT
+ %left REL_OP
+ %right ASSIGN_OP
+-%left '+' '-'
+ %left '*' '/' '%'
++%left '+' '-'
+ %right '^'
+ %nonassoc UNARY_MINUS
+ %nonassoc INCR_DECR
+"
+
+cat d18_input.txt | ./bc-1.07.1/build/bc/bc | awk 'BEGIN {x=0} {x+=$1} END {print x}'
diff --git a/d18_input.txt b/d18_input.txt
new file mode 100644
index 0000000..4eaf00c
--- /dev/null
+++ b/d18_input.txt
@@ -0,0 +1,376 @@
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diff --git a/d18_output.txt b/d18_output.txt
new file mode 100644
index 0000000..d82c9fb
--- /dev/null
+++ b/d18_output.txt
@@ -0,0 +1,2 @@
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