diff --git a/2020/day17.py b/2020/day17.py
index fb4550b..ac8578c 100644
--- a/2020/day17.py
+++ b/2020/day17.py
@@ -1,18 +1,20 @@
 import sys
+from itertools import product
 
 
 def main():
-    lines = [line.rstrip() for line in sys.stdin]; sys.stdin = open("/dev/tty")
+    lines = [line.rstrip() for line in sys.stdin]
 
-    print("Actives:", part1(lines))
-    print("Hyperactives:", part2(lines))
+    print("Actives:", solve(lines, 3))
+    print("Hyperactives:", solve(lines, 4))
 
 
-def part1(lines):
+def solve(lines, dimensions):
     s = {}
     for y, line in enumerate(lines):
         for x, c in enumerate(line):
-            s[(x, y, 0)] = 1 if c == "#" else 0
+            p = (x, y) + (0,) * (dimensions - 2)
+            s[p] = 1 if c == "#" else 0
     for _ in range(6):
         cycle(s)
     return sum(s.values())
@@ -20,59 +22,25 @@ def part1(lines):
 
 def cycle(s):
     future = {}
-    work_set = set(nn for x, y, z in s for nn in near(x, y, z))
-    for x, y, z in work_set:
+    work_set = set(nn for pos in s for nn in near(*pos))
+    for pos in work_set:
         an = 0
-        for nn in near(x, y, z):
+        for nn in near(*pos):
             an += s.get(nn, 0)
-        if (v := s.get((x, y, z), 0)) == 1 and not 2 <= an <= 3:
-            future[(x, y, z)] = 0
+        if (v := s.get(pos, 0)) == 1 and not 2 <= an <= 3:
+            future[pos] = 0
         elif v == 0 and an == 3:
-            future[(x, y, z)] = 1
+            future[pos] = 1
     for f, fv in future.items():
         s[f] = fv
 
 
-def near(x, y, z, include_self=False):
-    for zi in range(-1, 2):
-        for yi in range(-1, 2):
-            for xi in range(-1, 2):
-                if include_self or xi != 0 or yi != 0 or zi != 0:
-                    yield x + xi, y + yi, z + zi
-
-
-def part2(lines):
-    h = {}
-    for y, line in enumerate(lines):
-        for x, c in enumerate(line):
-            h[(x, y, 0, 0)] = 1 if c == "#" else 0
-    for _ in range(6):
-        cycle2(h)
-    return sum(h.values())
-
-
-def cycle2(h):
-    future = {}
-    work_set = set(nn for x, y, z, w in h for nn in hyper_near(x, y, z, w))
-    for x, y, z, w in work_set:
-        an = 0
-        for nn in hyper_near(x, y, z, w):
-            an += h.get(nn, 0)
-        if (v := h.get((x, y, z, w), 0)) == 1 and not 2 <= an <= 3:
-            future[(x, y, z, w)] = 0
-        elif v == 0 and an == 3:
-            future[(x, y, z, w)] = 1
-    for f, fv in future.items():
-        h[f] = fv
-
-
-def hyper_near(x, y, z, w, include_self=False):  # oh boy
-    for wi in range(-1, 2):
-        for zi in range(-1, 2):
-            for yi in range(-1, 2):
-                for xi in range(-1, 2):
-                    if include_self or xi != 0 or yi != 0 or zi != 0 or wi != 0:
-                        yield x + xi, y + yi, z + zi, w + wi
+def near(*comp):
+    num_comp = len(comp)
+    offsets = list(product([-1, 0, 1], repeat=num_comp))
+    offsets.remove((0,) * num_comp)
+    for p in offsets:
+        yield tuple(c + o for c, o in zip(comp, p))
 
 
 if __name__ == "__main__":