diff --git a/TDD-pure-function/src/main/java/de/edu/hsfulda/ciip/tdd/BownlingCalculator.java b/TDD-pure-function/src/main/java/de/edu/hsfulda/ciip/tdd/BownlingCalculator.java
index a582e3d..3166e56 100644
--- a/TDD-pure-function/src/main/java/de/edu/hsfulda/ciip/tdd/BownlingCalculator.java
+++ b/TDD-pure-function/src/main/java/de/edu/hsfulda/ciip/tdd/BownlingCalculator.java
@@ -1,10 +1,17 @@
 package de.edu.hsfulda.ciip.tdd;
 
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 public class BownlingCalculator {
 
 	public int evaluate(String listOfThrows) {
-		// TODO Auto-generated method stub
-		return 0;
+		Matcher matcher = Pattern.compile("\\d").matcher(listOfThrows);
+		int sum =0;
+		while (matcher.find()) {
+			sum+=Integer.parseInt(matcher.group());
+		}
+		return sum;
 	}
 
 }