diff --git a/2020/day05-customs-declaration.py b/2020/day05-customs-declaration.py
new file mode 100644
index 0000000..9ce1097
--- /dev/null
+++ b/2020/day05-customs-declaration.py
@@ -0,0 +1,29 @@
+from typing import List
+
+
+def main(filename: str, expected_part_1: int = None, expected_part_2: int = None):
+    print(f"\n+ Running on {filename}")
+    with open(filename) as f:
+        groups = f.read().strip().split("\n\n")  # type: List[str]
+
+    counter_part_1 = 0
+    counter_part_2 = 0
+    for group in groups:
+        counter_part_1 += len(set(group.replace("\n", "")))
+        people = group.split()
+        intersect = set.intersection(*list(map(set, people)))
+        counter_part_2 += len(intersect)
+
+    print(f"1. Found {counter_part_1}")
+    if expected_part_1:
+        assert expected_part_1 == counter_part_1
+
+    print(f"2. Found {counter_part_2}")
+    if expected_part_2:
+        assert expected_part_2 == counter_part_2
+
+
+if __name__ == "__main__":
+    main("inputs/day06-test1", 11, 6)
+    main("inputs/day06-test2", 15, 8)
+    main("inputs/day06", 6170, 2947)
diff --git a/2020/inputs/day06 b/2020/inputs/day06
new file mode 100644
index 0000000..f1d1388
--- /dev/null
+++ b/2020/inputs/day06
@@ -0,0 +1,2057 @@
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diff --git a/2020/inputs/day06-test1 b/2020/inputs/day06-test1
new file mode 100644
index 0000000..0f5b3bc
--- /dev/null
+++ b/2020/inputs/day06-test1
@@ -0,0 +1,15 @@
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diff --git a/2020/inputs/day06-test2 b/2020/inputs/day06-test2
new file mode 100644
index 0000000..e8d4acf
--- /dev/null
+++ b/2020/inputs/day06-test2
@@ -0,0 +1,20 @@
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