class Solution {
    public int timeRequiredToBuy(int[] tickets, int k) {
        int i = 0;
        int count = 0;
        while (tickets[k] > 0) {
            if (tickets[i] > 0) {
                tickets[i]--;
                count++;
            };
            if (i + 1 >= tickets.length) {
                i = 0;
            } else {
                i++;
            }
        }
        return count;
    }
}