diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
index 2de5c46..acf6548 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
@@ -124,9 +124,25 @@ public class Spreadsheet {
 	private void evaluateCell(int row, int col) {
 		String formula = cells[row][col].getFormula();
 		String result = "";
+		String sum1;
+		String sum2;
 
-		if (formula.startsWith("SUMME("))  // e.g. SUMME(A3:A8)
-			result = "" + sum(formula.substring(6, 8), formula.substring(9, 11));  // TODO adapt to cells with two digits
+		if (formula.startsWith("SUMME(")) { // e.g. SUMME(A3:A8) //SUMME(A13:B22)
+		/*	if(Character.isDigit(formula.charAt(8))) {
+				sum1= formula.substring(6, 9);
+				
+				if(Character.isDigit(formula.charAt(12))) {
+					sum2=formula.substring(10,13);
+				}else sum2=formula.substring(10,12);
+			}else {
+				sum1= formula.substring(6, 8);
+				if(Character.isDigit(formula.charAt(11))) {
+					sum2=formula.substring(9,12);
+				}else sum2=formula.substring(9,11);
+			
+			} */
+			result = "" + sum(getStartCellName(formula), getEndCellName(formula));  // TODO adapt to cells with two digits
+	}
 		else if (formula.startsWith("PRODUKT("))  // e.g. PRODUKT(A3:B9)
 			result = "TODO"; // TODO
 		else if (formula.startsWith("MITTELWERT("))  // e.g. MITTELWERT(A3:A5)
@@ -156,8 +172,31 @@ public class Spreadsheet {
 	 */
 	private long sum(String startCellName, String endCellName) {
 		// TODO implement
+		
+		int startRow=0;
+		int startCol=0;
+		
+		int endRow=0;
+		int endCol;
+		int sum=0;
+		int temp;
+		
+		startRow= getRow(startCellName);
+		startCol= getCol(startCellName);
+		
+		endRow= getRow(endCellName);
+		endCol= getCol(endCellName);
+		
+		for(int i= startRow; i<=endRow; i++) {
+			for(int j=startCol; j<=endCol; j++) {
+				
+				temp= Integer.parseInt(cells[i][j].getValue());
+				sum=sum+temp;
+				
+			}
+		}
 
-		return 0;
+		return sum;
 	}
 
 	/**
@@ -209,5 +248,37 @@ public class Spreadsheet {
 		}
 		return sb.toString();
 	}
+	
+	
+	
+	//methods to get correct cell names if they have more then 1 digit
+	
+	public String getStartCellName(String formula) {
+		
+		String startCell="";
+		if(Character.isDigit(formula.charAt(8))) {
+			startCell= formula.substring(6, 9);
+		}else startCell= formula.substring(6, 8);
+		
+		return startCell;
+	}
 
+	public String getEndCellName(String formula) {
+		
+		String endCell="";
+		
+		if(Character.isDigit(formula.charAt(8))) {
+			if(Character.isDigit(formula.charAt(12))) {
+				endCell=formula.substring(10,13);
+			}else endCell=formula.substring(10,12);
+		}else {
+				if(Character.isDigit(formula.charAt(11))) {
+					endCell=formula.substring(9,12);
+				}else endCell=formula.substring(9,11);
+				
+		}
+		
+		return endCell;
+	}
+	
 }
\ No newline at end of file