diff --git a/04/src/main/java/ch/zhaw/ads/HilbertServer.java b/04/src/main/java/ch/zhaw/ads/HilbertServer.java
new file mode 100644
index 0000000..0ce23f1
--- /dev/null
+++ b/04/src/main/java/ch/zhaw/ads/HilbertServer.java
@@ -0,0 +1,31 @@
+package ch.zhaw.ads;
+
+public class HilbertServer implements CommandExecutor {
+    Turtle turtle;
+
+    @Override
+    public String execute(String command) {
+        int depth = Integer.parseInt(command);
+        double dist = 0.8 / (Math.pow(2,depth+1)-1);
+        turtle = new Turtle(0.1, 0.1);
+        hilbert(depth, dist, -90);
+        return turtle.getTrace();
+    }
+
+    private void hilbert(int depth, double dist, double angle) {
+        if (depth >= 0) {
+            turtle.turn(-angle);
+            hilbert(depth-1, dist, -angle);
+            turtle.move(dist);
+            turtle.turn(angle);
+            hilbert(depth-1, dist, angle);
+            turtle.move(dist);
+            hilbert(depth-1, dist, angle);
+            turtle.turn(angle);
+            turtle.move(dist);
+            hilbert(depth-1, dist, -angle);
+            turtle.turn(-angle);
+        }
+    }
+
+}
diff --git a/04/src/main/java/ch/zhaw/ads/SnowflakeServer.java b/04/src/main/java/ch/zhaw/ads/SnowflakeServer.java
new file mode 100644
index 0000000..f152ac3
--- /dev/null
+++ b/04/src/main/java/ch/zhaw/ads/SnowflakeServer.java
@@ -0,0 +1,35 @@
+package ch.zhaw.ads;
+
+public class SnowflakeServer implements CommandExecutor {
+    Turtle turtle;
+
+    @Override
+    public String execute(String command) {
+        int n = Integer.parseInt(command);
+        turtle = new Turtle();
+
+        snowflake(Integer.parseInt(command), 0.8);
+        turtle.turn(-120);
+        snowflake(Integer.parseInt(command), 0.8);
+        turtle.turn(-120);
+        snowflake(Integer.parseInt(command), 0.8);
+        return turtle.getTrace();
+
+    }
+
+    private void snowflake(int stufe, double dist) {
+        if (stufe == 0) {
+            turtle.move(dist);
+        } else {
+            stufe--;
+            dist = dist/3;
+            snowflake(stufe,dist);
+            turtle.turn(60);
+            snowflake(stufe,dist);
+            turtle.turn(-120);
+            snowflake(stufe,dist);
+            turtle.turn(60);
+            snowflake(stufe,dist);
+        }
+    }
+}