def main():
    s = input()
    t = s[0]
    for i in range(len(s) - 1):
        if s[i].isdigit() and not s[i + 1].isdigit():
            t += "+" if s[i + 1] == "-" else "-"
        else:
            t += s[i + 1]
    print(eval(t))
    
    
if __name__ == '__main__':
    main()