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diff --git a/missions/.DS_Store b/missions/.DS_Store
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diff --git a/missions/W2/.DS_Store b/missions/W2/.DS_Store
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diff --git a/missions/W2/M3/M3.py b/missions/W2/M3/M3.py
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@@ -0,0 +1,41 @@
+import multiprocessing as mp
+
+# constants
+COLOR = ['red', 'green', 'blue', 'black']
+
+# working function
+def work(q:mp.Queue, iQ:mp.Queue, color:str):
+    i = iQ.get()    # get semaphore
+
+    # processing: put color to the Queue
+    q.put(color)
+    print(f"item no: {i} {color}")
+    
+    iQ.put(i+1)     # return semaphore
+
+if __name__ == "__main__":
+    proc = []           # processes
+    queue = mp.Queue()  # Color Queue
+    numQ = mp.Queue()   # number Queue; used like a semaphore
+
+    numQ.put(1) # initialize number Queue
+    
+    # processes start
+    print("pushing items to queue:")
+
+    for i in range(len(COLOR)):
+        p = mp.Process(target=work, args=(queue, numQ, COLOR[i]))
+        p.start()
+        proc.append(p)
+
+    # wait for processes
+    for p in proc:
+        p.join()
+    
+    # print result
+    print("popping items form queue:")
+
+    i = 0
+    while not queue.empty():
+        print(f"item no: {i} {queue.get()}")
+        i += 1
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