from re import findall

ts = findall('\+|\-|\d+', raw_input())
x, y, op, ans = None, None, None, None
if ts[0] == '-':
    x = -int(ts[1])
    ts = ts[2:]
elif ts[0] == '+':
    x = int(ts[1])
    ts = ts[2:]
else:
    x = int(ts[0])
    ts = ts[1:]
op = ts[0]
ts = ts[1:]
if ts[0] == '-':
    y = -int(ts[1])
elif ts[0] == '+':
    y = int(ts[1])
else:
    y = int(ts[0])
if op == '+':
    ans = x - y
else:
    ans = x + y
print(ans)