LUT help!!!

Ok i manage to do the first part of the project.What it does is :i insert some values for inputs(that will remain constants through all the process) and then when a clock EVENT i do this computation : input1*weight1+input2*weight2+input3*weight3.This is the multiply-accumulator unit.The second thing that i want to do(for which i need your help) is to compare this result(from the previous step) with a threshold and then fix the weight values in order to :

input1*weight1(new)+input2*weight2(new)+input3*weight3(new)>threshold.Here is my code

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

use ieee.std_logic_arith.all;

entity neuron is

port ( in1,in2,in3,w1,w2,w3 : in unsigned (7 downto 0);

clk : in std_logic;

id : out bit;

output : out unsigned (15 downto 0));

end neuron;

architecture behavioral of neuron is

type inputs is array (1 to 3) of unsigned (7 downto 0);

type weights is array (1 to 3) of unsigned (7 downto 0);

constant threshold : unsigned(15 downto 0):="0000011011100111";

constant sum : unsigned:="1";

begin

process(clk,w1,w2,w3)

variable weight : weights;

variable input : inputs;

variable prod,acc : unsigned (15 downto 0);

begin

if(clk'EVENT AND clk='1') then

input(1):=in1;

input(2):=in2;

input(3):=in3;

weight(1):=w1;

weight(2):=w2;

weight(3):=w3;

acc:=(others=>'0');

end if;

for j in 1 to 3 loop

prod:=input(j)*weight(j);

acc:=acc+prod;

end loop;

if(acc>threshold) then id<='1';

else id<='0';

end if;

output<=acc;

end process;

end behavioral;

I attached and a photo with the simulation results