diff --git a/GDP_Gesamt/src/Uebungen/Uebung5/Aufgabe4.java b/GDP_Gesamt/src/Uebungen/Uebung5/Aufgabe4.java
index 90826e1..599ab3a 100644
--- a/GDP_Gesamt/src/Uebungen/Uebung5/Aufgabe4.java
+++ b/GDP_Gesamt/src/Uebungen/Uebung5/Aufgabe4.java
@@ -18,25 +18,32 @@ public class Aufgabe4 {
         printArray(inputArray);
         int res=-1;
         int rangeMax=inputArray.length-1, rangeMin=0,center=0;
+        int diff;
         long lastdate=0;
-        center = (rangeMax+1 - rangeMin) / 2;  // round up
         while(res < 0){
             Date date = new Date();
             long deltaT = date.getTime()-lastdate;
             if(deltaT>timeout) {
                 lastdate = date.getTime();
+                diff = (rangeMax - rangeMin) / 2;  // intermediate value
+                if (diff==0) {
+                    if (value == inputArray[center]) {
+                        res = center;
+                    }
+                    else {
+                        res = center+1;
+                        center +=1; // not needed
+                    }
+                }
+                else {
+                    center = rangeMin + diff;
+                }
+
                 infoGraphic(value, center, rangeMin, rangeMax, rangeMax, inputArray);
-                if (value == inputArray[center]) {
-                    res = center;
-                } else if (value > inputArray[center]) {
+                if (value >= inputArray[center]) {
                     rangeMin = center;
-                    center += (rangeMax+1 - rangeMin) / 2;  // round up
-                    // center = (rangeMax+1 + rangeMin) / 2;  // round up
                 } else {
                     rangeMax = center;
-                    center -= (rangeMax+1 - rangeMin) / 2;  // round up
-                    //center -= (center+1 - rangeMin) / 2;
-                    // center = (rangeMax + rangeMin) / 2;
                 }
             }
         }