diff --git a/src/part4/aufg3.java b/src/part4/aufg3.java
index 232ca39..8095fd3 100644
--- a/src/part4/aufg3.java
+++ b/src/part4/aufg3.java
@@ -9,7 +9,7 @@ public class aufg3 {
     // =====================
 
     public static void main(String[] args){
-        int MAXIMUM = 100_000_000;
+        int MAXIMUM = 100_000_000;  // takes about 13 seconds(!!)
         int MAX_PER_ROW = 20;
 
         boolean[] primes = new boolean[MAXIMUM];
@@ -32,8 +32,9 @@ public class aufg3 {
             if(primes[i] && i > 1) {
                 System.out.print(i + " ");
                 counter++;
-                if (counter % MAX_PER_ROW == 0) {
+                if (counter == MAX_PER_ROW) {
                     System.out.println();
+                    counter = 0;
                 }
             }
         }