s = raw_input()
for i in xrange(0, 10):
        if str(i) + "+" in s:
                s = s.replace(str(i) + "+", str(i) + "-")
                break
        if str(i) + "-" in s:
                s = s.replace(str(i) + "-", str(i) + "+")
                break
print eval(s)