print((function (op, fh)
	local n,s = fh:read("*n"),fh:read("*l")
	for e in s:gmatch("[%+%*]%d+") do n=op[e:sub(1,1)](n,tonumber(e:sub(2))) end
	return n
end)({
	["+"]=function (a,b) return a*b end;
	["*"]=function (a,b) return a+b end
}, io.stdin))