## Exercise 1.1
```python
def zorglub(n: int) -> int:
	j = 1
	k = 0
	i = 1
	while i <= n:
		j = i * j
		k = j + k
		i = i + 1
	return k
```

The function return the sum of the factorial of n

## Exercise 1.2
```python
def multiplication(x: int, y: int) -> int:
	result = 0
	while y > 0:
		m += x
		y -= 1
	return result


def multiplication2(x: int, y: int) -> int: # Thanks Hugo :p
	if y < 0:
		y = -y
		if x < 0:
			return multiplication(-x, y)
		return -multiplication(x, y)			
	else
		return multiplication(x, y)

def productZ(x, y):
	pos = True
	if x < 0:
		x = -x 
		pos = False
	if y < 0:
		y = -y
		pos = not pos
	m = multiplication(x, y)
	if not pos:
		m = -m
	return m
```

## Exercise 1.3
```
def exponentiation(x: int, n: int) -> int: