diff --git a/inputs/input3 b/inputs/input3
new file mode 100644
index 0000000..1e40d38
--- /dev/null
+++ b/inputs/input3
@@ -0,0 +1,100 @@
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\ No newline at end of file
diff --git a/inputs/input3_test b/inputs/input3_test
new file mode 100644
index 0000000..6b2e9c9
--- /dev/null
+++ b/inputs/input3_test
@@ -0,0 +1,6 @@
+8-9 9-10
+7-8 8-10
+9-10 5-10
+3-10 9-10
+4-8 7-9
+9-10 2-7
\ No newline at end of file
diff --git a/problem3.py b/problem3.py
new file mode 100644
index 0000000..bcc0a19
--- /dev/null
+++ b/problem3.py
@@ -0,0 +1,32 @@
+my_input = open("inputs/input3", "r").read().splitlines()
+
+p1 = 0
+p2 = 0
+p3 = 0
+last_boxes = set()
+for line in my_input:
+    left, right = line.split(" ")
+    l_low, l_high = map(int, left.split("-"))
+    r_low, r_high = map(int, right.split("-"))
+    p1 += l_high - l_low + 1
+    p1 += r_high - r_low + 1
+
+    if r_low < l_low:
+        l_low, l_high, r_low, r_high = r_low, r_high, l_low, l_high
+
+    if l_high < r_low:
+        this_box_set = set(range(l_low, l_high + 1))
+        this_box_set |= set(range(r_low, r_high + 1))
+    else:
+        this_box_set = set(range(min(l_low, r_low), max(l_high, r_high) + 1))
+
+    p2 += len(this_box_set)
+    if len(this_box_set | last_boxes) > p3:
+        p3 = len(this_box_set | last_boxes)
+
+    last_boxes = this_box_set
+
+print(p1)
+print(p2)
+print(p3)
+