Given a positive integer n, return the sum of all integers in the range $[1,$ n$]$ inclusive that are divisible by $3$, $5$, or $7$.

Constraints:

• $1 \leq$ n $\leq 10^3$

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We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.