# 1. Import urllib and beautifulsoup
from urllib.request import urlopen
from bs4 import BeautifulSoup
import ssl

# 2. Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

# 3. Read HTML with urllib's urlopen() method
url = input('Enter - ')
html = urlopen(url, context=ctx).read()

# 4. Parse HTML with BeautifulSoup's BeautifulSoup() method
soup = BeautifulSoup(html, "html.parser")

# 5. Retrieve list of span tags
tags = soup('span')

ans = 0
# 6. Loop through to get numbers
for tag in tags:
    num = tag.contents[0]
    # Retrieve number with positions 0 onwards
    num_int = int(num[0:])
    ans += num_int
print (ans)