diff --git a/projects/xobusy/bojs/17954.py b/projects/xobusy/bojs/17954.py
index fc2b1f164..cd10161be 100644
--- a/projects/xobusy/bojs/17954.py
+++ b/projects/xobusy/bojs/17954.py
@@ -1,9 +1,10 @@
-from math import ceil
+#2n..2n-2 2n-1
+#n..n-3 n-2 n-1
+from copy import deepcopy
 a, b = (False, False)
 c = [[],[]]
 d = int(input())
 e = 0
-_cac = ceil((d*2) / 4)
 
 for i in range(1, d*2+1):
     if a:
@@ -18,13 +19,40 @@
         c[1].insert(-1, i)
         a = not a
     b = not b
-    t = ceil(i / 4)
-    e += (_cac-t) * i
 
 if d % 2 == 1:
     c[0].insert(-1, max(c[1][0], c[1][-1]))
     c[1].remove(max(c[1][0], c[1][-1]))
+t = 1
+answer = deepcopy(c)
+
+while len(c[0]) != 0 or len(c[1]) != 0:
+    try:
+        f = min(c[0][0], c[0][-1])
+    except IndexError:
+        g = min(c[1][0], c[1][-1])
+        c[1].remove(g)
+        for i in c:
+            for i2 in i:
+                e += t * i2
+        continue
+    try:
+        g = min(c[1][0], c[1][-1])
+    except IndexError:
+        c[0].remove(f)
+        for i in c:
+            for i2 in i:
+                e += t * i2
+        continue
+    if f <= g:
+        c[0].remove(f)
+    else:
+        c[1].remove(g)
+    for i in c:
+        for i2 in i:
+            e += t * i2
+    t += 1
 
 print(e)
-print(*c[0])
-print(*c[1])
+print(*answer[0])
+print(*answer[1])