def add(a, b):
    """Add two numbers and return the result."""
    return a + b

def subtract(a, b):
    """Subtract b from a and return the result."""
    return a - b

def multiply(a, b):
    """Multiply two numbers and return the result."""
    return a * b

def divide(a, b):
    """Divide a by b and return the result."""
    if b == 0:
        raise ValueError("Cannot divide by zero")
    return a / b

def is_even(number):
    """Check if a number is even."""
    return number % 2 == 0

if __name__ == "__main__":
    print("Without Alexandr's name")