class Solution:
    def findPoisonedDuration(self, timeSeries: List[int], duration: int) -> int:
        if len(timeSeries) == 0: return 0

        time = 0
        for i in range(0, len(timeSeries) - 1):
            if timeSeries[i] + duration > timeSeries[i + 1]:
                time += timeSeries[i + 1] - timeSeries[i]
            else:
                time += duration
        time += duration
        return time