chore(tools): fix parsed as octal

cmd.txt

@@ -1 +1,3 @@
+. .venv/bin/activate
+export PYTHONPATH=${PYTHONPATH:-$(realpath lib)}
 command cd "$(./get_input.sh)" && less input

get_input.sh

@@ -5,6 +5,7 @@ cd "$(dirname $(realpath $0))"
 . .env
 
 d=$(date +%d)
+e=$(bc <<< "$d + 0")
 
 mkdir -p d${d}
 cd d${d}
@@ -16,6 +17,6 @@ cd d${d}
   -H 'Connection: close' \
   -H "Cookie: session=$SESSION" \
   -o input  \
-  "https://adventofcode.com/2024/day/$(( $d + 0 ))/input"
+  "https://adventofcode.com/2024/day/$e/input"
 
 echo $(realpath .)