# Advent of Code 2018
# December 01, puzzle 1

import sys

def main(args):
    freqlist = [0]
    arglist = args.split(",")
    arglist = [x.strip() for x in arglist]
    freq = 0
    for item in arglist:
        if item[0] == "+":
            freq += int(item[1:])
        elif item[0] == "-":
            freq -= int(item[1:])
    return freq

if __name__ == "__main__":
    args = input("Paste the modulations here: ")
    print(main(args))