## 1716. Calculate Money in Leetcode Bank

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 *`n`

^{th}* day.*

**Example 1:**

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

**Example 2:**

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

**Example 3:**

Input:n = 20Output:96Explanation:After the 20^{th}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`

## Rust Solution

```
struct Solution;
impl Solution {
fn total_money(n: i32) -> i32 {
let mut res = 0;
for i in 0..n {
res += (i % 7) + (i / 7) + 1;
}
res
}
}
#[test]
fn test() {
let n = 4;
let res = 10;
assert_eq!(Solution::total_money(n), res);
let n = 10;
let res = 37;
assert_eq!(Solution::total_money(n), res);
let n = 20;
let res = 96;
assert_eq!(Solution::total_money(n), res);
}
```

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