diff --git a/2017/d23/main.rkt b/2017/d23/main.rkt
new file mode 100644
index 0000000..8dec25a
--- /dev/null
+++ b/2017/d23/main.rkt
@@ -0,0 +1,27 @@
+#lang reader "../aoc-lang.rkt"
+(provide (rename-out [#%mb #%module-begin]) ★ ★★)
+
+(define-macro (#%mb (STARS) TOKS ...)
+  #`(#%module-begin
+     (time (STARS (vector (λ () TOKS) ...)))))
+
+(define regs (make-hasheq))
+(struct offset-signal (val))
+
+(provide set mul sub jnz)
+(define-macro (value VAL) #'(let ([val 'VAL]) (if (number? val) val (hash-ref! regs val 0))))
+(define-macro (set REG VAL) #'(hash-set! regs 'REG (value VAL)))
+(define-macro (sub REG VAL) #'(hash-update! regs 'REG (λ (val) (- val (value VAL))) 0))
+(define-macro (mul REG VAL) #'(begin (hash-update! regs 'mul-count add1 0)
+                                     (hash-update! regs 'REG (λ (val) (* val (value VAL))) 0)))
+(define-macro (jnz REG VAL) #'(when (not (zero? (value REG))) (raise (offset-signal (value VAL)))))
+
+(define (★ insts)
+  (for/fold ([offset 0]
+             #:result (hash-ref regs 'mul-count))
+            ([i (in-naturals)]
+             #:break (not (<= 0 offset (sub1 (vector-length insts)))))
+    (with-handlers ([offset-signal? (λ (os) (+ (offset-signal-val os) offset))])
+      (define proc (vector-ref insts offset))
+      (proc)
+      (add1 offset))))
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diff --git a/2017/d23/star1.rkt b/2017/d23/star1.rkt
new file mode 100644
index 0000000..026e6f4
--- /dev/null
+++ b/2017/d23/star1.rkt
@@ -0,0 +1,33 @@
+#lang reader "main.rkt" ★ ; 8281
+set b 93
+set c b
+jnz a 2
+jnz 1 5
+mul b 100
+sub b -100000
+set c b
+sub c -17000
+set f 1
+set d 2
+set e 2
+set g d
+mul g e
+sub g b
+jnz g 2
+set f 0
+sub e -1
+set g e
+sub g b
+jnz g -8
+sub d -1
+set g d
+sub g b
+jnz g -13
+jnz f 2
+sub h -1
+set g b
+sub g c
+jnz g 2
+jnz 1 3
+sub b -17
+jnz 1 -23
\ No newline at end of file