Hello!

I am attempting to play around with writing math expressions in python, but I keep coming up with the `TypeError: 'int' object is not callable`

.

Here is my code below, please let me know if you can see what might be the issue!

```
import math
def score_function(n,k):
k_score = (n - ((n-2*k*math.sqrt(n/k) + k + 1)/2)**2 - n)/(n(n-1))
#returns an interger
return k_score
def check_function():
n = 11
for k in range(1, n+1):
print(n, k, score_function(n, k))
check_function()
```