------
## 最终结论
```python
def kth_element(arr, n, k):
    arr.sort()
    return arr[k-1]

assert kth_element([12,3,5,7,19], 5, 2) == 3
assert kth_element([17,24,8,23], 4, 3) == 8
assert kth_element([16,21,25,36,4], 5, 4) == 36
```