```
def knapSack(W, wi, pi, i):
if i == 0 or W == 0:
return 0
if (wi[i-1] > W):
return knapSack(W, wi, pi, i-1)
else:
return max(
pi[n-1] + knapSack(
W-wi[n-1], wi, pi, n-1),
knapSack(W, wi, pi, n-1))
pi = [25, 5, 20, 120, 100, 0, 30, 0, 0, 75, 100]
wi = [2, 4, 1, 8, 10, 5, 3, 7, 6, 12, 7]
W = 30
n = len(pi)
knapSack(W, wi, pi, n)
```

I expect the answer of function at the end but I keep getting errors .

I get (maximum recursion depth exceeded)error but I don’t think it’s the problem .

### >Solution :

The `knappSack()`

function is given the parameter `i`

but in the function you are still using `n`

, which will stay the same in the recursions. Changing to

```
def knapSack(W, wi, pi, i):
if i == 0 or W == 0:
return 0
if (wi[i-1] > W):
return knapSack(W, wi, pi, i-1)
else:
return max(
pi[i-1] + knapSack(W-wi[i-1], wi, pi, i-1),
knapSack(W, wi, pi, i-1))
pi = [25, 5, 20, 120, 100, 0, 30, 0, 0, 75, 100]
wi = [2, 4, 1, 8, 10, 5, 3, 7, 6, 12, 7]
W = 30
n = len(pi)
knapSack(W, wi, pi, n)
```

should solve the issue.