Unable to import web data

General
1 
install.packages("XML")
library(XML)
url <- "https://bvb-prices.ro/stock/BVB/"
BVB_data = readHTMLTable(url, which=2)
2

If I open this URL in a browser, it seems to only contain a number, not an html page.

The documentation of that webpage suggests using Google Sheet IMPORTDATA, which from its documentation, expects a csv or tsv. In that case the equivalent R command might be:

read.table(url)

or

readLines(url)