There are n people standing in a circle. They are numbered from 1 to n in clockwise order. Starting from the first person, we go clockwise and skip k-1 people, and the k-th person is eliminated. The process continues until only one person remains. Return the index of the last person remaining.

• Two integers n and k.

Input: n = 5, k = 2
Output: 3
Explanation:

1. 2 is eliminated. (1, 3, 4, 5) remains.
2. 4 is eliminated. (1, 3, 5) remains.
3. 1 is eliminated. (3, 5) remains.
4. 5 is eliminated. 3 remains.