Selling and buying X should validate correctly they are between unsigned short boundaries

[lmsv-mx123]

When Jagex placed the sell and buy x on store probably they thought was sent over as integer or an oversight of them (likely). Anyways currently is Integer.parseInt(input) and should be more like type of Short.parseUnsignedShort(input), that can be simulated that if the input > 65535 to throw NumberFormatException, else return the parsed num