# -*- coding: utf-8 -*-
def string2int(s):
    N = len(s)
    tmp = 0
    res = 0
    sgn = 1
    for i in range(N):
        if s[i] == '+':
            res += tmp * sgn
            tmp = 0
            sgn = 1
        elif s[i] == '-':
            res += tmp * sgn
            tmp = 0
            sgn = -1
        else:
            tmp = tmp * 10 + int(s[i])
    res += tmp * sgn
    return res

A, B = input().split()
print(string2int(A + B))