diff --git a/Prog3.iml b/Prog3.iml
index c90834f..5dfd50f 100644
--- a/Prog3.iml
+++ b/Prog3.iml
@@ -4,8 +4,10 @@
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="junit.jupiter" level="project" />
   </component>
 </module>
\ No newline at end of file
diff --git a/src/Praktikum03/Zahlenfilter.java b/src/Praktikum03/Zahlenfilter.java
new file mode 100644
index 0000000..70d439c
--- /dev/null
+++ b/src/Praktikum03/Zahlenfilter.java
@@ -0,0 +1,43 @@
+package Praktikum03;
+
+
+public class Zahlenfilter {
+
+    public static void main(String[] args) {
+        int upper_limit = 200;
+        if (args.length > 0)
+            upper_limit = Integer.parseInt(args[0]);
+        Zahlenfilter z = new Zahlenfilter(upper_limit);
+        z.printNumber();
+    }
+
+    private int boundary;
+
+    private Zahlenfilter(int limit){
+        boundary = limit;
+    }
+
+    private void printNumber(){
+        for(int i = 1; i <=boundary; i++){
+            if(filter(i))
+                System.out.println(i);
+        }
+    }
+
+    public static boolean filter(int i){
+        return !(checkDivisibleBy5(i) || checkEndsWith9(i) || checkSumDivisibleBy3(i, i-1));
+    }
+
+    public static boolean checkDivisibleBy5(int i) {
+        return(i % 5 == 0);
+
+    }
+
+    public static boolean checkEndsWith9(int i){
+        return(i % 10 == 9);
+    }
+
+    public static boolean checkSumDivisibleBy3(int i, int j){
+        return((i+j) % 3 == 0);
+    }
+}
diff --git a/test/Praktikum03/ZahlenfilterTest.java b/test/Praktikum03/ZahlenfilterTest.java
new file mode 100644
index 0000000..019ea0a
--- /dev/null
+++ b/test/Praktikum03/ZahlenfilterTest.java
@@ -0,0 +1,66 @@
+package Praktikum03;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ZahlenfilterTest {
+
+    @Test
+    void filter() {
+    }
+
+    @Test
+    void checkDivisibleBy5() {
+        int i = 15;
+
+        boolean result = Zahlenfilter.checkDivisibleBy5(i);
+
+        assertTrue(result);
+    }
+
+    @Test
+    void checkNotDivisibleBy5() {
+        int i = 12;
+
+        boolean result = Zahlenfilter.checkDivisibleBy5(i);
+
+        assertFalse(result);
+    }
+
+    @Test
+    void checkEndsWith9() {
+        int i = 29;
+
+        boolean result = Zahlenfilter.checkEndsWith9(i);
+
+        assertTrue(result);
+    }
+
+    @Test
+    void checkEndsNotWith9() {
+        int i = 28;
+
+        boolean result = Zahlenfilter.checkEndsWith9(i);
+
+        assertFalse(result);
+    }
+
+    @Test
+    void checkSumDivisibleBy3() {
+        int i = 5;
+
+        boolean result = Zahlenfilter.checkSumDivisibleBy3(i, i-1);
+
+        assertTrue(result);
+    }
+
+    @Test
+    void checkSumNotDivisibleBy3() {
+        int i = 3;
+
+        boolean result = Zahlenfilter.checkSumDivisibleBy3(i, i-1);
+
+        assertFalse(result);
+    }
+}
\ No newline at end of file