02. Number

function numModify(num) {
    let average = 0;
    let numToString = num.toString();
    while (average < 5) {
        let digitsCount = numToString.length;
        let sum = 0;
        for (let index = 0; index < digitsCount; index++) {
            sum += Number(numToString[index]);
        }
        average = sum / digitsCount;
        if (average < 5) {
            numToString += '9';
        }
    }

    console.log(Number(numToString));
}