Describe what this function does. Try different numbers as input.

```
def test(num):
if num > 0:
return test(num-1) + num
else:
return 0
```

This method recursively calls itself with a decremented number, but adds that decremented number to the returned value till it hits 0. This causes it to return 3 for 2, 6 for 3, 10 for 4, and so on.