#!/usr/bin/env python
#
# total.py
#
# Copyright 2017 Todd Shadburn <tshadburn@opencomputingsolutions.com>
#
# Licensed under the GNU GPL version 2
#

import sys

total = 0.0
for ln in sys.stdin:
	s = ln.strip(' \r\n')
	if len(s):
		try:
			total += float(s)
		except:
			pass
print total
sys.exit(0)