diff --git a/.classpath b/.classpath
deleted file mode 100644
index fceb480..0000000
--- a/.classpath
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
-	<classpathentry kind="output" path="bin"/>
-</classpath>
diff --git a/.gitignore b/.gitignore
index 539bdba..6e17738 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,12 @@
 .metadata
 bin/
+out/
 tmp/
 *.tmp
 *.bak
 *.swp
 *~.nib
+.idea/
 local.properties
 .settings/
 .loadpath
diff --git a/.project b/.project
deleted file mode 100644
index a91a890..0000000
--- a/.project
+++ /dev/null
@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>GitAssignmentObserver</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-	</natures>
-</projectDescription>
diff --git a/src/Circle.java b/src/Circle.java
new file mode 100644
index 0000000..850ebea
--- /dev/null
+++ b/src/Circle.java
@@ -0,0 +1,10 @@
+public class Circle implements ISubscriber{
+    public void notifySubscriber(String input){
+        Integer radius = Integer.parseInt(input);
+        System.out.println("The circle area is: " + calculateArea(radius));
+    }
+
+    private double calculateArea(Integer radius){
+        return Math.PI * radius * radius;
+    }
+}
diff --git a/src/CircleCircumference.java b/src/CircleCircumference.java
new file mode 100644
index 0000000..eaf506e
--- /dev/null
+++ b/src/CircleCircumference.java
@@ -0,0 +1,7 @@
+public class CircleCircumference implements ISubscriber{
+    @Override
+    public void notifySubscriber(String input){
+        double radius = Integer.parseInt(input);
+        System.out.println ("CircleCircumference: "+2*Math.PI*radius);
+    }
+}
diff --git a/src/CircleVolum.java b/src/CircleVolum.java
new file mode 100644
index 0000000..9e525ad
--- /dev/null
+++ b/src/CircleVolum.java
@@ -0,0 +1,6 @@
+public class CircleVolum implements ISubscriber{
+    public void notifySubscriber(String input){
+        Integer radius = Integer.parseInt(input);
+        System.out.println ("Circlevolum: "+4/3*Math.PI*radius);
+    }
+}
diff --git a/src/Lucas.java b/src/Lucas.java
new file mode 100644
index 0000000..3205227
--- /dev/null
+++ b/src/Lucas.java
@@ -0,0 +1,19 @@
+public class Lucas implements ISubscriber {
+    int tmp[] = {2,1};
+    @Override
+    public void notifySubscriber(String input) {
+        System.out.print("Lucas: ");
+        int intInput = Integer.parseInt(input);
+        for (int i=0; i<intInput; i++){
+            if (i==0) System.out.print(2 + " ");
+            else if(i==1) System.out.print(1 + " ");
+            else {
+                int res = tmp[0] + tmp[1];
+                tmp[0] = tmp[1];
+                tmp[1] = res;
+                System.out.print(res + " ");
+            }
+        }
+        System.out.println(" ");
+    }
+}
diff --git a/src/Main.java b/src/Main.java
index 9b8c2b0..bfc4bf9 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -2,8 +2,15 @@
 
 public class Main {
 	private static ISubscriber subscribers [] = {
-			new SimpleSubscriber(),
-			new ReallySimpleSubscriber(),
+			new TwoPowerN(),
+			new Circle(),
+			new Shperevolume(),
+			new CircleCircumference(),
+			new CircleVolum(),
+			new Lucas(),
+			new SphereArea(),
+			new SphereCircumference(),
+			new fibonacci()
 	};
 	public static void main(String[] args) {
 		Topic mathTopic = new Topic();
diff --git a/src/MultiplicationSeries.java b/src/MultiplicationSeries.java
new file mode 100644
index 0000000..951e989
--- /dev/null
+++ b/src/MultiplicationSeries.java
@@ -0,0 +1,21 @@
+import java.text.DecimalFormat;
+
+public class MultiplicationSeries implements ISubscriber{
+
+	public void notifySubscriber(String input) {
+		DecimalFormat df= new DecimalFormat();
+		double n= Integer.parseInt(input);
+		System.out.println("Term "+df.format(n)+" is "+df.format(getTerm(n))+". ");
+	}
+  
+	public static double getTerm(double j){
+		if (j==1) return 1;
+		if (j==2) return 2;
+		if (j<=0){
+			System.out.println("Error");
+		}
+		return getTerm(j-1)*getTerm(j-2);
+		
+	}
+
+}
diff --git a/src/Shperevolume.java b/src/Shperevolume.java
new file mode 100644
index 0000000..ba98972
--- /dev/null
+++ b/src/Shperevolume.java
@@ -0,0 +1,15 @@
+
+
+
+public class Shperevolume implements ISubscriber {
+
+	public void notifySubscriber(String input) {
+
+		double redius=Integer.parseInt(input);
+
+
+		double volume = (4*22*redius*redius*redius)/(3*7);
+		System.out.println("The sphere volume is: " + volume);
+	}
+
+}
diff --git a/src/SphereArea.java b/src/SphereArea.java
new file mode 100644
index 0000000..fbff9c0
--- /dev/null
+++ b/src/SphereArea.java
@@ -0,0 +1,10 @@
+
+public class SphereArea implements ISubscriber{
+
+    @Override
+    public void notifySubscriber(String input) {
+        int intInput = Integer.parseInt(input);
+        double res = 4.0 * 3.14159265359 * intInput * intInput;
+        System.out.print("The sphere area is : " + res + "\n");
+    }
+}
diff --git a/src/SphereCircumference.java b/src/SphereCircumference.java
new file mode 100644
index 0000000..a7a74d1
--- /dev/null
+++ b/src/SphereCircumference.java
@@ -0,0 +1,8 @@
+public class SphereCircumference implements ISubscriber {
+	 @Override
+	    public void notifySubscriber(String input){
+	        double r = Integer.parseInt(input);
+	        System.out.println ("Circumference of a Sphere: "+2*Math.PI*r);
+	    }
+
+}
diff --git a/src/TwoPowerN.java b/src/TwoPowerN.java
new file mode 100644
index 0000000..671530c
--- /dev/null
+++ b/src/TwoPowerN.java
@@ -0,0 +1,13 @@
+public class TwoPowerN implements ISubscriber{
+
+    //20170053
+    @Override
+    public void notifySubscriber(String input) {
+        int n = Integer.parseInt(input);
+        int sum = 1;
+        for(int i=0;i<n;i++){
+            sum *= 2;
+        }
+        System.out.println("2 Power " + n + " equals " + sum);
+    }
+}
diff --git a/src/fibonacci.java b/src/fibonacci.java
new file mode 100644
index 0000000..550c739
--- /dev/null
+++ b/src/fibonacci.java
@@ -0,0 +1,15 @@
+public class fibonacci implements ISubscriber {
+    public void notifySubscriber(String input) {
+        Integer intinput = Integer.parseInt(input);
+
+        int previousNumber = 0;
+        int nextNumber = 1;
+        System.out.print("Fibonacci Series of " + intinput + " numbers: ");
+        for (int i = 1; i <= intinput; ++i) {
+            System.out.print(previousNumber + " ");
+            int sum = previousNumber + nextNumber;
+            previousNumber = nextNumber;
+            nextNumber = sum;
+        }
+    }
+}
\ No newline at end of file