Always pass the radix to parseInt
`parseInt` method takes two parameters:
The second parameter specifies the current numeral system. In the case it's not specified, then it will be set automatically based on the value.
If the value starts with
`0X`, then the radix is 16 (hexadecimal). In other cases, the radix is 10 (decimal).
`0` then the radix is set as 8 (octal).