When Run CRM report if you don't get exact page count as below,
You can changes this by changing CRM report viewer aspx file.
go to
CRM/CRMWeb/CRMReports/rsviewer/reportviewer.aspx file
and change the below highlighted report control properties by adding PageCountMode="Actual" property.
In default report viwer pageCountMode is Estimate.
</head>
<body style="<%if (doNotShowBorder) { %> border-style:none;<% } %>">
<div style="height:100%; width:100%; position:absolute">
<form id="form1" runat="server" style="height:100%">
<asp:ScriptManager id="scriptManager" runat="server" />
<rsweb:ReportViewer id="reportViewer" runat="server" width="100%" height="100%"/>
</form>
</div>
</body>
</html>
<rsweb:ReportViewer id="reportViewer" PageCountMode="Actual" runat="server" width="100%" height="100%"/>
