```python
def setup():
i = 12
py5.println(py5.log(i))
py5.println(log10(i))
j = -5
py5.println(py5.log(j))
# Calculates the base-10 logarithm of a number
# use this if you don't want to use numpy's log10 function
def log10(x):
return (py5.log(x) / py5.log(10))
```