- Use math
Hercy wants to save money for his first car. He puts money in the Leetcode bank every day.
He starts by putting in $
Monday, the first day. Every day from Tuesday to Sunday, he will put in
$1 more than the day before. On every
subsequent Monday, he will put in
$1 more than the previous Monday.
Given n, return the
total amount of money he will have in the Leetcode bank at the end of the nth day.
Input: n = 20