diff --git a/LabPSA_2/eighth.py b/LabPSA_2/eighth.py
index 8b13789..a546c52 100644
--- a/LabPSA_2/eighth.py
+++ b/LabPSA_2/eighth.py
@@ -1 +1,35 @@
 
+import random
+
+participants, n, days = list(), 10, 10000
+
+
+def random_list():
+    l = list()
+    while len(l) < n:
+        x = random.randint(1,n)
+        if x not in l:
+            l.append(x)
+    return l
+
+
+for i in range(n):
+    participants.append(i)
+
+ans = 0
+for i in range(days):
+    lunch, dinner = random_list(), random_list()
+    # print(dinner)
+    # print(lunch)
+    for j in range(1, n+1):
+        idx1 = lunch.index(j)
+        # print(idx1)
+        idx2 = dinner.index(j)
+        q = [lunch[idx1-1], lunch[(idx1+1) % n]]
+        w = [dinner[idx2-1], dinner[(idx2+1) % n]]
+        # print(w)
+        # print(q)
+        if q[0] in w or q[1] in w:
+            ans += 1
+            break
+print(1 - ans/days)