f = open('24-A.txt')
s = f.readline()
b = 123
d = ''
for i in range(3, len(s) - 1):
    if s[i] == '+':
        z = i + 1
        while s[z] != '+' and s[z] != '-':
            if '0' <= s[z] <= '9':
                d += s[z]
            z += 1
            if z == len(s):
                break
        b += int(d)
        d = ''
    elif s[i] == '-':
        z = i + 1
        while s[z] != '+' and s[z] != '-':
            if '0' <= s[z] <= '9':
                d += s[z]

            z += 1
            if z == len(s):
                break
        b -= int(d)
        d = ''
print(b)