You are given two categories of theme park attractions: land rides and water rides.

A tourist must experience exactly one ride from each category, in either order.

Return the earliest possible time at which the tourist can finish both rides.

Input: landStartTime = [2,8], landDuration = [4,1], waterStartTime = [6], waterDuration = [3]

Output: 9

Explanation:

Plan A (land ride 0 → water ride 0):
- Start land ride 0 at time landStartTime[0] = 2. Finish at 2 + landDuration[0] = 6.
- Water ride 0 opens at time waterStartTime[0] = 6. Start immediately at 6, finish at 6 + waterDuration[0] = 9.
Plan B (water ride 0 → land ride 1):
- Start water ride 0 at time waterStartTime[0] = 6. Finish at 6 + waterDuration[0] = 9.
- Land ride 1 opens at landStartTime[1] = 8. Start at time 9, finish at 9 + landDuration[1] = 10.
Plan C (land ride 1 → water ride 0):
- Start land ride 1 at time landStartTime[1] = 8. Finish at 8 + landDuration[1] = 9.
- Water ride 0 opened at waterStartTime[0] = 6. Start at time 9, finish at 9 + waterDuration[0] = 12.
Plan D (water ride 0 → land ride 0):
- Start water ride 0 at time waterStartTime[0] = 6. Finish at 6 + waterDuration[0] = 9.
- Land ride 0 opened at landStartTime[0] = 2. Start at time 9, finish at 9 + landDuration[0] = 13.

Plan A gives the earliest finish time of 9.

Input: landStartTime = [5], landDuration = [3], waterStartTime = [1], waterDuration = [10]

Output: 14

Explanation:

Plan A (water ride 0 → land ride 0):
- Start water ride 0 at time waterStartTime[0] = 1. Finish at 1 + waterDuration[0] = 11.
- Land ride 0 opened at landStartTime[0] = 5. Start immediately at 11 and finish at 11 + landDuration[0] = 14.
Plan B (land ride 0 → water ride 0):
- Start land ride 0 at time landStartTime[0] = 5. Finish at 5 + landDuration[0] = 8.
- Water ride 0 opened at waterStartTime[0] = 1. Start immediately at 8 and finish at 8 + waterDuration[0] = 18.

Plan A provides the earliest finish time of 14.