diff --git a/Week04/functions_nazmi_emir_ozer.py b/Week04/functions_nazmi_emir_ozer.py
new file mode 100644
index 00000000..fcbd23c1
--- /dev/null
+++ b/Week04/functions_nazmi_emir_ozer.py
@@ -0,0 +1,28 @@
+import os
+
+custom_power = lambda x=0, /, e=1 : x**e
+
+def custom_equation(x: int=0 ,y: int=0,/,a: int=1,b: int=1,*,c: int=1) ->float:
+    """
+    This function returns a mathematical equation
+
+    :param x:first number to be exponentiated
+    :param y:second number to be exponentiated
+    :param a:power of the first number
+    :param b:power of the second number
+    :param c:divisor of the sum of exponentiated
+    :return:the result of the equation
+
+    """
+    return (x**a + y**b) / c
+
+
+caller_dict = {}
+call_counter = 0
+
+def fn_w_counter() -> (int, dict[str, int]):
+    caller = __name__
+    global call_counter
+    call_counter += 1
+    caller_dict[caller] = caller_dict.get(caller, 0) + 1
+    return call_counter, caller_dict
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