diff --git a/03-a.kts b/03-a.kts
new file mode 100644
index 0000000..8451fe7
--- /dev/null
+++ b/03-a.kts
@@ -0,0 +1,13 @@
+import java.util.Scanner
+import java.util.regex.Pattern
+
+val pattern: Pattern = Pattern.compile("mul\\([0-9]+,[0-9]+\\)")
+val scanner = Scanner(System.`in`)
+
+var sum = 0
+while (true) {
+    val next: String = scanner.findWithinHorizon(pattern, 0) ?: break
+
+    sum += next.replace("mul(", "").replace(")", "").split(",").map { it.toInt() }.let { (a, b) -> a*b }
+}
+println(sum)
\ No newline at end of file
diff --git a/03-b.kts b/03-b.kts
new file mode 100644
index 0000000..ff03734
--- /dev/null
+++ b/03-b.kts
@@ -0,0 +1,21 @@
+import java.util.Scanner
+import java.util.regex.Pattern
+
+val pattern: Pattern = Pattern.compile("mul\\([0-9]+,[0-9]+\\)|do\\(\\)|don't\\(\\)")
+
+val scanner = Scanner(System.`in`)
+
+var sum = 0
+var enabled = true
+while (true) {
+    val next: String = scanner.findWithinHorizon(pattern, 0) ?: break
+
+    when (next) {
+        "do()" -> enabled = true
+        "don't()" -> enabled = false
+        else -> if (enabled) {
+            sum += next.replace("mul(", "").replace(")", "").split(",").map { it.toInt() }.let { (a, b) -> a*b }
+        }
+    }
+}
+println(sum)
\ No newline at end of file