diff --git a/day04/day04.py b/day04/day04.py
new file mode 100644
index 0000000..3e8be8f
--- /dev/null
+++ b/day04/day04.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+import re
+
+assignment_pairs = [
+    "2-4,6-8", 
+    "2-3,4-5", 
+    "5-7,7-9", 
+    "2-8,3-7", 
+    "6-6,4-6", 
+    "2-6,4-8"]
+
+def pair_issubset(pair):
+    a, b, c, d = map(int, re.split('\-|\,', pair))
+    section1 = set(range(a, b+1)).issubset(set(range(c, d+1)))
+    section2 = set(range(c, d+1)).issubset(set(range(a, b+1)))
+    return section1 or section2
+
+def pair_notdisjoint(pair):
+    a, b, c, d = map(int, re.split('\-|\,', pair))
+    return not set(range(a, b+1)).isdisjoint(set(range(c, d+1)))    
+
+if __name__ == "__main__":
+
+    sum_fully_contain = 0
+    sum_overlap = 0
+    for pair in assignment_pairs:
+        if pair_issubset(pair):
+            sum_fully_contain += 1
+        if pair_notdisjoint(pair):
+            sum_overlap += 1
+
+    print("Part 1 test: %s" % sum_fully_contain)
+    print("Part 2 test: %s" % sum_overlap)
+
+    file = open("input","r")
+    lines = file.read().splitlines()
+    sum_fully_contain = 0
+    sum_overlap = 0
+    for pair in lines:
+        if pair_issubset(pair):
+            sum_fully_contain += 1
+        if pair_notdisjoint(pair):
+            sum_overlap += 1
+
+    print("Part 1: %s" % sum_fully_contain)
+    print("Part 2: %s" % sum_overlap)
diff --git a/day04/input b/day04/input
new file mode 100644
index 0000000..e2d1be7
--- /dev/null
+++ b/day04/input
@@ -0,0 +1,1000 @@
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