1716. money in leetcode bank

main.js

/**
 * @param {number} n
 * @return {number}
 */
var totalMoney = function(n) {
    let total = 0
    let numWeeks = Math.floor(n / 7)
    let remainingDays = n % 7

    for (let i=0; i < remainingDays; i++) {
        total += i + (numWeeks + 1)
    }
    
    for (let weekNumber=0; weekNumber < numWeeks; weekNumber++) {
        weekCost = 28 + (weekNumber * 7)
        total += weekCost
    }

    return total
};