## 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
```
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:
	result = 0
	if x < 0 and y < 0:
		i = 0
		x = -x 
		y = -y
        while i < y:
            result = result + x
            i += 1
        return result
	elif y < 0:
		y = -y
		i = 0
        while i < y:
            result = result + x
            i += 1
        return -result
	else:
		i = 0
        while i < y:
            result = result + x
            i += 1
        return result

def multiplication2(x: int, y: int) -> int:
	if x < 0 and y < 0:
		return multiplication(-x, -y)
	elif y < 0:
		return -multiplication(x, -y)
	elif x < 0:
		return -multiplication(-x, y)
	else
		return multiplication(x, y)
```

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