In this task, you're given the title of a story consisting of five sentences, numbered 1 through 5. Your job is to arrange the sentences in order to make a story that makes complete sense and is apt for the title. Indicate your answer using the number of the sentences in order, such as '34152'.

Title: High Tide. Sentence 1: By when he was finishing the tide was high. Sentence 2: He was building a sand castle. Sentence 3: Tim's sand castle was soon washed away. Sentence 4: It was elaborate and taking him a long time. Sentence 5: Tim was at the beach.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
52413