task20

with open("finances.txt", mode="rt", encoding="utf-8") as file:
    strings = file.readlines()

    outnum = 0
    for s in strings:
        tmp = s.split()
        if s[0] == '+':
            outnum += int(s[1])
        elif s[0] == '-':
            outnum -= int(s[1])
    print(outnum)