diff --git a/os/code/os/src/main/java/com/scaler/addersubtractor/Adder.java b/os/code/os/src/main/java/com/scaler/addersubtractor/Adder.java
index d42c8f2..3d674c8 100644
--- a/os/code/os/src/main/java/com/scaler/addersubtractor/Adder.java
+++ b/os/code/os/src/main/java/com/scaler/addersubtractor/Adder.java
@@ -10,7 +10,17 @@ public class Adder implements Runnable {
     public void run() {
 
         for (int i = 1; i <= 100; ++i) {
-            count.getValue().getAndAdd(i);
+            
+            int value = count.getValue();
+            try {
+                Thread.sleep(50);
+            } catch (Exception e) {
+                System.out.println("Something wrong happened");
+            }
+
+            int nextValue = value + i;
+            count.setValue(nextValue);
+
             try {
                 Thread.sleep(10);
             } catch (Exception e) {
diff --git a/os/code/os/src/main/java/com/scaler/addersubtractor/Count.java b/os/code/os/src/main/java/com/scaler/addersubtractor/Count.java
index 348de30..37942dc 100644
--- a/os/code/os/src/main/java/com/scaler/addersubtractor/Count.java
+++ b/os/code/os/src/main/java/com/scaler/addersubtractor/Count.java
@@ -1,15 +1,13 @@
 package com.scaler.addersubtractor;
 
-import java.util.concurrent.atomic.AtomicInteger;
-
 public class Count {
-    private AtomicInteger value = new AtomicInteger(0);
+    private volatile int value = 0;
 
-    public AtomicInteger getValue() {
+    public int getValue() {
         return value;
     }
 
-    public void setValue(AtomicInteger value) {
+    public void setValue(int value) {
         this.value = value;
     }
 }
diff --git a/os/code/os/src/main/java/com/scaler/addersubtractor/Subtractor.java b/os/code/os/src/main/java/com/scaler/addersubtractor/Subtractor.java
index ae80473..c346cd8 100644
--- a/os/code/os/src/main/java/com/scaler/addersubtractor/Subtractor.java
+++ b/os/code/os/src/main/java/com/scaler/addersubtractor/Subtractor.java
@@ -1,7 +1,5 @@
 package com.scaler.addersubtractor;
 
-import java.util.concurrent.locks.Lock;
-
 import lombok.AllArgsConstructor;
 
 @AllArgsConstructor
@@ -12,7 +10,17 @@ public class Subtractor implements Runnable {
     public void run() {
 
         for (int i = 1; i <= 100; ++i) {
-            count.getValue().getAndAdd(-i);
+            
+            int value = count.getValue();
+            try {
+                Thread.sleep(50);
+            } catch (Exception e) {
+                System.out.println("Something wrong happened");
+            }
+
+            int nextValue = value - i;
+            count.setValue(nextValue);
+
             try {
                 Thread.sleep(10);
             } catch (Exception e) {