_Remove page number on the first slide - Beamer Presentation R Markdown

[quote="hinh, post:1, topic:137140, full:true"]

title: 'CHAPTER 14: THE LOST TWO DECADES'
author: "Tran Tuan Hinh "
date: "5/11/2022"
output:
  beamer_presentation: default
  slidy_presentation: default
header-includes:
  - \setbeamertemplate{navigation symbols}{} 
  - \setbeamertemplate{footline}[frame number]
  
  

Please tell me how to remove the page number on the first page of my presentation.