s = io.read()
n = string.len(s)
pos = 1
a, pos, num = string.find(s, "(%d+)")
num = tonumber(num)
while(pos < n) do
    pos = pos + 1
    op = string.sub(s, pos, pos)
    pos = pos + 1
    a, pos, b = string.find(s, "(%d+)", pos)
    b = tonumber(b)
    if(op == "*") then num = num + b else num = num * b end
end
print(num)