function numberModitification(n) {
    while (getAvrg(n) < 5) {
        n += '9'
    }
    return n

    function checkForAvrg(num) {
        let result = 0
        num = num.toString()
        for (let i = 0; i < num.length; i++) {
            result += Number(num[i])
        }
        return result
    }

    function getAvrg(n) {
        return checkForAvrg(n) / n.toString().length
    }
}