Angularjs Combo box value form submit

This is my angular combobox

<select ui-select2 id="UserID" name="UserID" ng-model="userObjs.UserID" data-placeholder="UserID" required style="width: 100%;">
                                <option value="">Select Agent</option>
                                <option ng-repeat="(key, userObj) in userObjs" ng-value="userObj.id" value="@" >@
                                </option>
</select>

while submitting this form to laravel controller

$UserID= $request->UserID;

it showing number:33 , but actual User Id is 33, how to get only integer by avoing number: to the variable $UserID

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