diff --git a/Seminar 7/problem-in-class/Computer.py b/Seminar 7/problem-in-class/Computer.py
new file mode 100644
index 0000000..1895f13
--- /dev/null
+++ b/Seminar 7/problem-in-class/Computer.py	
@@ -0,0 +1,16 @@
+class Computer:
+    def __init__(self, cpu, memory, storage):
+        self.__cpu = cpu
+        self.__memory = memory
+        self.__storage = storage
+
+    @property
+    def _memory(self):
+        return self.__memory
+
+    @_memory.setter
+    def _memory(self, value):
+        self.__memory = value
+    
+    def __str__(self) -> str:
+        return f"CPUs: {self.__cpu}; Memory: {self.__memory}; Storage: {self.__storage}; "
diff --git a/Seminar 7/problem-in-class/GamingLaptop.py b/Seminar 7/problem-in-class/GamingLaptop.py
new file mode 100644
index 0000000..f73d95c
--- /dev/null
+++ b/Seminar 7/problem-in-class/GamingLaptop.py	
@@ -0,0 +1,8 @@
+from Laptop import Laptop
+
+class GamingLaptop(Laptop):
+    def __init__(self, cpu, memory, storage):
+        Laptop.__init__(self, cpu, memory, storage, 5)
+
+    def playExtremeGames():
+        print("Playing some super cool games.")
\ No newline at end of file
diff --git a/Seminar 7/problem-in-class/Laptop.py b/Seminar 7/problem-in-class/Laptop.py
new file mode 100644
index 0000000..b2e8e53
--- /dev/null
+++ b/Seminar 7/problem-in-class/Laptop.py	
@@ -0,0 +1,27 @@
+from Computer import Computer
+
+class Laptop(Computer):
+    pass
+    def __init__(self, cpu, memory, storage, gpu):
+        Computer.__init__(self, cpu, memory, storage)
+        self.__gpu = gpu
+
+    @property
+    def memory(self):
+        return self._memory
+
+    @memory.setter
+    def memory(self, value):
+        self._memory = value
+
+    def startPlayingGames(self, game):
+        if(self.__gpu < 2):
+            print("You can't play games on this laptop.")
+        else:
+            print(f"Playing {game}")
+
+    def startDesigning(self):
+        if(self.__gpu < 1):
+            print("You can't use this laptop for design.")
+        else:
+            print("Designing")
\ No newline at end of file
diff --git a/Seminar 7/problem-in-class/Smartphone.py b/Seminar 7/problem-in-class/Smartphone.py
new file mode 100644
index 0000000..2f009ed
--- /dev/null
+++ b/Seminar 7/problem-in-class/Smartphone.py	
@@ -0,0 +1,18 @@
+from Computer import Computer
+
+class Smartphone(Computer):
+    pass
+    def __init__(self, cpu, memory, storage, cellular, phoneNumber):
+        Computer.__init__(self, cpu, memory, storage)
+        self.__cellular = cellular
+        self.__phoneNumber = phoneNumber
+
+
+    def receivePhoneCall(self):
+        print(f"{self.__phoneNumber} is receiving a call.")
+
+    def makePhoneCall(self, to_number):
+        print(f"{self.__phoneNumber} will call {to_number}")
+
+    def __str__(self) -> str:
+        return super().__str__() + f"Cellular: {self.__cellular}; Phone number: {self.__phoneNumber}"
\ No newline at end of file
diff --git a/Seminar 7/problem-in-class/main.py b/Seminar 7/problem-in-class/main.py
new file mode 100644
index 0000000..3502919
--- /dev/null
+++ b/Seminar 7/problem-in-class/main.py	
@@ -0,0 +1,18 @@
+from Laptop import Laptop
+from Smartphone import Smartphone
+from GamingLaptop import GamingLaptop
+
+def main():
+    print('starting main')
+    bad_laptop = Laptop(2.4, 16, 512, 0.1)
+    glaptop = GamingLaptop(4, 16, 1024)
+    sp = Smartphone(1, 2, 8, 'A1', '0883')
+
+    bad_laptop.startPlayingGames('CS')
+    glaptop.startPlayingGames('CS')
+    sp.makePhoneCall("testing")
+    
+    print(bad_laptop)
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file