[LeetCode]#1716. Calculate Money in Leetcode Bank

Environment: Python 3.8

Key technique: while

Hercy wants to save money for his first car. He puts money in the Leetcode bank every day.

He starts by putting in `\$1` on 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.

Example 1:

`Input: n = 4Output: 10Explanation: After the 4th day, the total is 1 + 2 + 3 + 4 = 10.`

Analysis:

1. input is divided by 7.
2. Calculate multiple
3. Calculate remainder
4. return 2+3

Solution:

`class Solution:    def totalMoney(self, n):        d=int(n/7)        i=d        r=n%7        ans=0        while i >0:            ans+=int(((i+(i+7-1))*7)/2)            i=i-1        if r>0:            ans=ans+int((((d+1)+(d+r))*r)/2)        return ans`

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