#!/usr/bin/python
# $Id: sumcol.python.html,v 1.5 2004/07/03 07:11:34 bfulgham Exp $
# http://www.bagley.org/~doug/shootout/
# with help from Mark Baker

import sys, itertools

#def main():
#    count = 0
#    for line in sys.stdin.xreadlines():
#        count += int(line)
#    print count
#
#main()

# A terser, but slower, implementation by Stéfane Fermigier
# print reduce(lambda x, y: x + int(y), sys.stdin.xreadlines(), 0)

# New version, by Josh Hoyt
print sum(itertools.imap(int, sys.stdin))