diff --git a/.idea/runConfigurations/2021___Day_03.xml b/.idea/runConfigurations/2021___Day_03.xml
new file mode 100644
index 0000000..06d565d
--- /dev/null
+++ b/.idea/runConfigurations/2021___Day_03.xml
@@ -0,0 +1,11 @@
+<component name="ProjectRunConfigurationManager">
+ <configuration default="false" name="2021 - Day 03" type="JetRunConfigurationType">
+ <option name="MAIN_CLASS_NAME" value="MainKt" />
+ <module name="Advent_of_Code.2021-03" />
+ <shortenClasspath name="NONE" />
+ <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/2021/03" />
+ <method v="2">
+ <option name="Make" enabled="true" />
+ </method>
+ </configuration>
+</component>
\ No newline at end of file
diff --git a/2021/03/input/1.txt b/2021/03/input/1.txt
new file mode 100644
index 0000000..3566496
--- /dev/null
+++ b/2021/03/input/1.txt
@@ -0,0 +1,1000 @@
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diff --git a/2021/03/main.kt b/2021/03/main.kt
new file mode 100644
index 0000000..1c98121
--- /dev/null
+++ b/2021/03/main.kt
@@ -0,0 +1,19 @@
+import java.io.File
+
+fun main() {
+ val lines = File("input/1.txt").readLines().filter(String::isNotEmpty)
+
+ val totalRows = lines.size
+ val totalColumns = lines[0].length
+ val totalOnesPerColumn = Array(totalColumns) { column ->
+ lines.count { it[column] == '1' }
+ }
+
+ val gammaRate = totalOnesPerColumn
+ .map { if (it > totalRows / 2) 1 else 0 }
+ .foldIndexed(0) { index, total, bit -> total or (bit shl (totalColumns - index - 1)) }
+
+ val epsilonRate = gammaRate xor ((1 shl totalColumns) - 1)
+
+ println("Power consumption: ${gammaRate * epsilonRate}")
+}
diff --git a/README.md b/README.md
index 3a04e9f..29e8dbd 100644
--- a/README.md
+++ b/README.md
@@ -32,3 +32,4 @@ The versions should not matter, but I used Visual Studio 2019 with `MSVC v142 (1
| 2015 | 01 | NASM x86 |
| 2021 | 01 | Kotlin |
| 2021 | 02 | Kotlin |
+| 2021 | 03 | Kotlin |
diff --git a/build.gradle.kts b/build.gradle.kts
index bdd3154..c4acd2f 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -34,4 +34,5 @@ sourceSets {
make(2021, 1)
make(2021, 2)
+ make(2021, 3)
}