diff --git a/advent-of-code-2022.csproj b/advent-of-code-2022.csproj
index 3f05c41..78dccc5 100644
--- a/advent-of-code-2022.csproj
+++ b/advent-of-code-2022.csproj
@@ -77,6 +77,8 @@
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+	  <None Remove="inputs\04a.txt" />
+	  <EmbeddedResource Include="inputs\04a.txt" />
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diff --git a/inputs/04.txt b/inputs/04.txt
index 48cc64f..bd97ce1 100644
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\ No newline at end of file
diff --git a/inputs/04a.txt b/inputs/04a.txt
new file mode 100644
index 0000000..afe345c
--- /dev/null
+++ b/inputs/04a.txt
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
\ No newline at end of file
diff --git a/src/04.cs b/src/04.cs
new file mode 100644
index 0000000..8c1f8ef
--- /dev/null
+++ b/src/04.cs
@@ -0,0 +1,39 @@
+namespace aoc2022;
+
+internal class Day04 : Day
+{
+    private readonly List<((int min, int max) one,(int min, int max) two)> assignmentPairs = new();
+
+    internal override void Parse()
+    {
+        foreach (var line in Util.ReadAllLines("04"))
+        {
+            var assignments = line.Split(',');
+            var firstAssignment = assignments[0].Split('-');
+            var secondAssignment = assignments[1].Split('-');
+            var firstRange = (int.Parse(firstAssignment[0]), int.Parse(firstAssignment[1]));
+            var secondRange = (int.Parse(secondAssignment[0]), int.Parse(secondAssignment[1]));
+            assignmentPairs.Add((firstRange, secondRange));
+        }
+    }
+
+    internal override string Part1()
+    {
+        var overlaps = assignmentPairs.Count(x =>
+            (x.one.min >= x.two.min && x.one.max <= x.two.max) ||
+            (x.two.min >= x.one.min && x.two.max <= x.one.max));
+
+        return $"# complete overlaps: <+white>{overlaps}";
+    }
+
+    internal override string Part2()
+    {
+        var overlaps = assignmentPairs.Count(x =>
+            (x.one.min >= x.two.min && x.one.min <= x.two.max) ||
+            (x.one.max >= x.two.min && x.one.max <= x.two.max) ||
+            (x.two.min >= x.one.min && x.two.min <= x.one.max) ||
+            (x.two.max >= x.one.min && x.two.max <= x.one.max));
+
+        return $"# partial overlaps: <+white>{overlaps}";
+    }
+}