Calculation on Visualforce Page without using Controller

$(document).ready(function(){
var count = 0;
count+=$(':input').length;
count+=$("select").length;
var datalistCount =$("datalist").length;
count+= datalistCount;
count+=$("textarea").length;
$(".TotalCountOfField").val(count - 1 - datalistCount);
});

Create two variable and then add with '+' in third variable in apex page without any controller.

Try this code snippet:

<apex:page standardController="Property__c">
<apex:outputText value="Purchase: "/><apex:outputText value="{0, number, $###,###}"><apex:param value="{!Property__c.PurchPrice__c}" /></apex:outputText><br/>
<apex:outputText value="Rehab: "/><apex:outputText value="{0, number, $###,###}"><apex:param value="{!Property__c.TotalRehab__c}" /></apex:outputText><br/>
<apex:outputText value="Total: "/><apex:outputText value="{0, number, $###,###}"><apex:param value="{!Property__c.PurchPrice__c + Property__c.TotalRehab__c}" /></apex:outputText><br/>
</apex:page>

Thanks.