S = input()
minus = False
tmp = ""
if (S[0] == '+'):
    tmp += '+'
elif (S[0] == '-'):
    tmp += '-'
else:
    tmp += S[0]
op = True

for i in range(1, len(S)):
    if (S[i] == '+'):
        if (op):
            tmp += '-'
            op = False
        else:
            tmp += '+'
    elif (S[i] == '-'):
        if (op):
            tmp += '+'
            op = False
        else:
            tmp += '-'
    else:
        tmp += S[i]
        op = True

print (eval(tmp))