#!/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}'