#!/usr/bin/env python
# -*- coding: utf-8 -*-


if __name__ == '__main__':
    freq = 0

    with open("input.txt") as fp:
        line = fp.readline()
        while line:
            if line[:1] == "+":
                freq += int(line[1:])
            else:
                freq -= int(line[1:])
            line = fp.readline()

    print(freq)