diff --git a/day07/part2.py b/day07/part2.py
index d5aadc5..df7052e 100644
--- a/day07/part2.py
+++ b/day07/part2.py
@@ -4,5 +4,6 @@ lines = (list(map(int, x.strip().split(','))) for x in open("input.txt"))
 
 for line in lines:
     line.sort()
-    median = round(sum(line) / len(line))
-    print(min(sum(abs(x - m)*(abs(x - m)+1)//2 for x in line) for m in range(median-1, median+2)))
+    mean = round(sum(line) / len(line))
+    # fix of by one error
+    print(min(sum(abs(x - m)*(abs(x - m)+1)//2 for x in line) for m in range(mean-1, mean+2)))
diff --git a/mathekalender.py b/mathekalender.py
new file mode 100644
index 0000000..97d518f
--- /dev/null
+++ b/mathekalender.py
@@ -0,0 +1,28 @@
+from itertools import combinations
+
+names = ["Eisstedt", "Frostberg", "Gletscherdorf", "Kaltburg", "Schneeheim", "Winterthal"]
+games = list(combinations(names, 2))
+table = {name: 0 for name in names}
+
+
+def play(idx):
+    if idx >= len(games):
+        yield []
+    else:
+        [a, b] = games[idx]
+        table[a] += 3
+        yield from map(lambda x: ["{} > {}".format(a[0], b[0])] + x, play(idx+1))
+        table[a] -= 2
+        table[b] += 1
+        yield from map(lambda x: ["{} = {}".format(a[0], b[0])] + x, play(idx+1))
+        table[a] -= 1
+        table[b] += 2
+        yield from map(lambda x: ["{} < {}".format(a[0], b[0])] + x, play(idx+1))
+        table[b] -= 3
+
+
+for playouts in play(0):
+    success = all(table[a]-2 == table[b] for a, b in zip(names[:-1], names[1:]))
+    if success:
+        print(table)
+        print(playouts)