diff --git a/Kontrollstrukturen/afg3 sieb/.gitignore b/Kontrollstrukturen/afg3 sieb/.gitignore
new file mode 100644
index 0000000..f68d109
--- /dev/null
+++ b/Kontrollstrukturen/afg3 sieb/.gitignore	
@@ -0,0 +1,29 @@
+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/Kontrollstrukturen/afg3 sieb/.idea/.gitignore b/Kontrollstrukturen/afg3 sieb/.idea/.gitignore
new file mode 100644
index 0000000..13566b8
--- /dev/null
+++ b/Kontrollstrukturen/afg3 sieb/.idea/.gitignore	
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/Kontrollstrukturen/afg3 sieb/.idea/misc.xml b/Kontrollstrukturen/afg3 sieb/.idea/misc.xml
new file mode 100644
index 0000000..6f29fee
--- /dev/null
+++ b/Kontrollstrukturen/afg3 sieb/.idea/misc.xml	
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Kontrollstrukturen/afg3 sieb/.idea/modules.xml b/Kontrollstrukturen/afg3 sieb/.idea/modules.xml
new file mode 100644
index 0000000..ad6e67b
--- /dev/null
+++ b/Kontrollstrukturen/afg3 sieb/.idea/modules.xml	
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/afg3 sieb.iml" filepath="$PROJECT_DIR$/afg3 sieb.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/Kontrollstrukturen/afg3 sieb/.idea/vcs.xml b/Kontrollstrukturen/afg3 sieb/.idea/vcs.xml
new file mode 100644
index 0000000..b2bdec2
--- /dev/null
+++ b/Kontrollstrukturen/afg3 sieb/.idea/vcs.xml	
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Kontrollstrukturen/afg3 sieb/afg3 sieb.iml b/Kontrollstrukturen/afg3 sieb/afg3 sieb.iml
new file mode 100644
index 0000000..c90834f
--- /dev/null
+++ b/Kontrollstrukturen/afg3 sieb/afg3 sieb.iml	
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/Kontrollstrukturen/afg3 sieb/src/Main.java b/Kontrollstrukturen/afg3 sieb/src/Main.java
new file mode 100644
index 0000000..c4fa0a0
--- /dev/null
+++ b/Kontrollstrukturen/afg3 sieb/src/Main.java	
@@ -0,0 +1,40 @@
+
+import java.util.Arrays;
+
+public class Main {
+
+    // =====================
+    // Sieb des Erathostenes (kopiert von Matti)
+    // =====================
+
+    public static void main(String[] args){
+        int MAXIMUM = 100;
+        int MAX_PER_ROW = 20;
+
+        boolean[] primes = new boolean[MAXIMUM];
+
+        Arrays.fill(primes, true);
+
+        for(int i=2; i < MAXIMUM * 0.5; i++){
+            for(int j=2; j < MAXIMUM; j++){
+
+                int index = i * j;
+
+                if(index < MAXIMUM && index > 0){
+                    primes[index] = false;
+                }
+            }
+        }
+
+        int counter = 0;
+        for(int i=0; i < primes.length; i++){
+            if(primes[i] && i > 1) {
+                System.out.print(i + " ");
+                counter++;
+                if (counter % MAX_PER_ROW == 0) {
+                    System.out.println();
+                }
+            }
+        }
+    }
+}