--- /dev/null
+'use strict';
+module.exports = function (x) {
+ if (typeof x !== 'number') {
+ throw new TypeError('Expected a number');
+ }
+
+ return x === 300 ||
+ x === 301 ||
+ x === 302 ||
+ x === 303 ||
+ x === 305 ||
+ x === 307 ||
+ x === 308;
+};