# \donttest{
# Create a temporary file with sample book IDs
temp_file <- tempfile(fileext = ".txt")
writeLines(c("1420", "2767052", "10210"), temp_file)
# Run the function
num_pages <- get_num_pages(temp_file)
print(num_pages)
# Clean up: remove the temporary file
file.remove(temp_file)
# }
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