1716. Calculate Money in Leetcode Bank

#### QUESTION:

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

Example 2:

``````Input: n = 10
Output: 37
Explanation: After the 10th day, the total is (1 + 2 + 3 + 4 + 5 + 6 + 7) + (2 + 3 + 4) = 37. Notice that on the 2nd Monday, Hercy only puts in \$2.
``````

Example 3:

``````Input: n = 20
Output: 96
Explanation: After the 20th day, the total is (1 + 2 + 3 + 4 + 5 + 6 + 7) + (2 + 3 + 4 + 5 + 6 + 7 + 8) + (3 + 4 + 5 + 6 + 7 + 8) = 96.
``````

Constraints:

``````1 <= n <= 1000
``````

#### SOLUTION:

``````class Solution {
func totalMoney(_ n: Int) -> Int {
var result: Int = 0
var count = n % 7 == 0 ? n / 7 : n/7+1
for index in    0..<count {
if index == n/7 && n%7 != 0 {
result += totalMoneyHelper(index + 1, n%7)
} else {
result += totalMoneyHelper(index + 1, 7)
}
}
return result
}

func totalMoneyHelper(_ nstart: Int , _ count: Int) -> Int {
var result: Int = 0
var nstart = nstart
for index in 0...count - 1 {
result += nstart
nstart += 1
}
return result
}
}
``````
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