diff --git a/calculator.py b/calculator.py
index 9f8b6b8..0357be9 100644
--- a/calculator.py
+++ b/calculator.py
@@ -13,6 +13,32 @@ def subtract(a, b):
 def divide(a, b):
 	return a / b
 
-print("I'm going use the calculator functions to multiply 5 and 6")
-x = multiply(5,6)
-print(x)
\ No newline at end of file
+
+def square(x):
+	return x * x
+
+
+def cube(x):
+	return x * x * x
+
+
+def square_n_times(number, n):
+	"""Square `number` repeatedly `n` times and return the sum.
+
+	On each iteration, the current value is squared and added to the total.
+	For example, with number=2 and n=3:
+	- iteration 1: 2^2 = 4
+	- iteration 2: 4^2 = 16
+	- iteration 3: 16^2 = 256
+	Sum returned: 4 + 16 + 256 = 276
+
+	If `n` is 0, returns 0. Expects non-negative integer `n`.
+	"""
+	if n < 0:
+		raise ValueError("n must be a non-negative integer")
+	result = 0
+	current = number
+	for _ in range(n):
+		current = current * current
+		result += current
+	return result
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