my code isn't working for some reason

Question

in the javascript-intermediate course, exactly at the code project "Store Manager", the app tells me that my code is wrong even though it is correct
here is the code ==>
function main() {
var increase = parseInt(readLine(), 10);
var prices = [98.99, 15.2, 20, 1026];
//your code goes here
for(let i = 0; i < prices.length; i++){
prices[i] += increase
}
console.log(prices)
}
main()
_____the code output is NaN, you may think that the variable increase is a string but it is also a number, I checked with the typeof method
I hope someone replies___

Answer 1

remove the last line:
main()

Answer 2

Give us a link of your code