s = io.read()
s = string.gsub(s, "%+%+", "+")
s = string.gsub(s, "%+%-", "-")
s = string.gsub(s, "%-%+", "-")
s = string.gsub(s, "%-%-", "+")
as, a, bs, b = string.match(s, "([%+%-]*)(%d+)([%+%-])(%d+)")
a = tonumber(a)
b = tonumber(b)
if(as == "-") then a = -a end
if(bs == "+") then io.write(a - b) else io.write(a + b) end
io.write("\n")