diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java
index 7de087e..fac0c3e 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java
@@ -16,27 +16,31 @@ public class Axel {
 		Scanner input = new Scanner(System.in);
 		
 		spr.put("A3", "123");
-		spr.put("A2", "1");
 		
-		spr.put("B9", "=41+A2");
-		spr.put("J5", "=7*6");
-		spr.put("J6", "=3/2");
+		spr.put("B9", "=41+A2+10-2/3");
 		
 		System.out.println("Schreibe 'stop' zum anhalten.");
 		do{
 			String command = "";
 			String form = "";
 			String cell= "";
+			boolean cellTRUE = true;
 			System.out.println(spr);
 			System.out.println("Befehl (z.B. D4_=7*6): ");
 			command = input.nextLine();
 			if(command.contentEquals("stop"))
 				break;
-			for(int i = 3; i<command.length();i++) {
-				form+=command.charAt(i);
+			for(int i = 0; i<command.length();i++) {
+				if(command.charAt(i)=='_') {
+					cellTRUE = false;
+					continue;
+				}
+				if(cellTRUE) {
+					cell+=command.charAt(i);
+				}else {
+					form+=command.charAt(i);
+				}
 			}
-			cell+=command.charAt(0);
-			cell+=command.charAt(1);
 			
 			spr.put(cell, form);
 			
diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
index 2241b80..961b416 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
@@ -5,6 +5,9 @@ import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import java.util.ArrayList;
+import java.util.List;
+
 
 /**
  * A simplified spreadsheet class for the PR1 programming lab at Hochschule Mannheim.
@@ -32,8 +35,18 @@ public class Spreadsheet {
 	}
 
 	// -----
+	/*
+	 * @param str A String with multiple numbers.
+	 * @return true if there are ONLY numbers in this sting.
+	 */
+	private boolean isNumber(String str) {
+        return str.matches("[0-9]+");
+    }
+	private boolean isCar(String str) {//Brum
+        return str.matches("[-\\+\\*/]+");
+    }
 	// retrieve or change values of cells
-
+	
 	private String get(int row, int col) {
 		return cells[row][col].getValue();
 	}
@@ -57,7 +70,15 @@ public class Spreadsheet {
 		return cellName.charAt(0) - 'A';
 	}
 	private int getRow(String cellName) {
-		return cellName.charAt(1) - '1';
+		if (cellName.length()==2) {
+			return cellName.charAt(1) - '1';
+		}else {
+			int Row = 0;
+			Row +=((cellName.charAt(1)-48)*10);
+			Row +=(cellName.charAt(2)-49);
+			System.out.println(Row);
+			return Row;
+		}
 	}
 	// -----
 	// business logic
@@ -160,19 +181,52 @@ public class Spreadsheet {
 	private long calculate(String formula) throws ArithmeticException {
 		Matcher m = Pattern.compile("([A-Z][0-9]*)|[-\\+\\*/]|[0-9]*").matcher(formula);
 
-		long res = 0;
-
-		// TODO implement
-
-		// uncomment the following to see an example how the elements of a formula can be accessed
-		while (m.find()) {        // m.find() must always be used before m.group()
-			String s = m.group();
-			if (!s.isEmpty()) {
-				System.out.println(s);
+		List<String> args = new ArrayList<>();
+		
+		while (m.find()) {
+			if(!m.group().isEmpty()) {
+				if(isNumber(m.group())||isCar(m.group())) {
+					args.add(m.group());
+				}else {
+					if(cells[getRow(m.group())][getCol(m.group())].getValue().isEmpty()) 
+						args.add("0");
+					else
+						args.add(m.group());
+				}
 			}
 		}
-
-		return res;
+		
+		for(int i = 2; i<args.size();) {
+			System.out.println(args.get(i));
+			String val = "";
+			switch(args.get(i-1)) {
+				case "+":
+					val =""+ (Integer.parseInt(args.get(i-2))+Integer.parseInt(args.get(i)));
+					args.set(i,val);
+					args.remove(i-1);
+					args.remove(i-2);
+					break;
+				case "-":
+					val =""+ (Integer.parseInt(args.get(i-2))-Integer.parseInt(args.get(i)));
+					args.set(i,val);
+					args.remove(i-1);
+					args.remove(i-2);
+					break;
+				case "*" :
+					val =""+ (Integer.parseInt(args.get(i-2))*Integer.parseInt(args.get(i)));
+					args.set(i,val);
+					args.remove(i-1);
+					args.remove(i-2);
+					break;
+				case "/":
+					val =""+ (Integer.parseInt(args.get(i-2))/Integer.parseInt(args.get(i)));
+					args.set(i,val);
+					args.remove(i-1);
+					args.remove(i-2);
+					break;
+			}
+		}
+		return Long.parseLong(args.get(0));
 	}
 
 	// -----