how to satisfy this code

I have made a version of mine of the binary game. what I want to do is when I click the answer1 button, it will add the value of the 8 buttons. If the answer is equal to the randomized number, it will generate again a random number. In my case, it does not generate a number.. what should be the problem? heres the code :

private var startTime;

private var restSeconds : int;

private var roundedRestSeconds : int;

private var displaySeconds : int;

private var displayMinutes : int;

var button1;

var button2;

var button3;

var button4;

var button5;

var button6;

var button7;

var button8;

var answer1;

var countDownSeconds : int;

var decimal;

var screenW;

function Update(){

screenW=Screen.currentResolution.width;

if(answer1==decimal){

     decimal=decimal=Random.Range(1, 128);

     }

}

function Start()

{ button1=1;

  button2=1;

  button3=1;

  button4=1;

  button5=1;

  button6=1;

   button7=1;

  button8=1;

 decimal= Random.Range(1, 128);

}

function OnGUI(){

//first button line

 GUI.Label(Rect(10,0,100,30),"128");

 if(GUI.Button(Rect(10,20,100,100),button1.ToString())){

     if(button1==1){

         button1=0;

     }

     else if(button1==0){

         button1=1;

     }

 }

 GUI.Label(Rect(110,0,100,30),"64");

 if(GUI.Button(Rect(110,20,100,100),button2.ToString())){

     if(button2==1){

         button2=0;

     }

     else if(button2==0){

         button2=1;

     }

 }

 GUI.Label(Rect(210,0,100,30),"32");

 if(GUI.Button(Rect(210,20,100,100),button3.ToString())){

     if(button3==1){

         button3=0;

     }

     else if(button3==0){

         button3=1;

     }

 }

 GUI.Label(Rect(310,0,100,30),"16");

 if(GUI.Button(Rect(310,20,100,100),button4.ToString())){

 

 if(button4==1){

         button4=0;

     }

     else if(button4==0){

         button4=1;

     }

 

 }

 GUI.Label(Rect(410,0,100,30),"8");

 if(GUI.Button(Rect(410,20,100,100),button5.ToString())){

     if(button5==1){

         button5=0;

     }

     else if(button5==0){

         button5=1;

     }

 }

 GUI.Label(Rect(510,0,100,30),"4");

 if(GUI.Button(Rect(510,20,100,100),button6.ToString())){

     if(button6==1){

         button6=0;

     }

     else if(button6==0){

         button6=1;

     }

 }

 GUI.Label(Rect(610,0,100,30),"2");

 if(GUI.Button(Rect(610,20,100,100),button7.ToString())){

     if(button7==1){

         button7=0;

     }

     else if(button7==0){

         button7=1;

     }

 }

 GUI.Label(Rect(710,0,100,30),"1");

 if(GUI.Button(Rect(710,20,100,100),button8.ToString())){

     if(button8==1){

         button8=0;

     }

     else if(button8==0){

         button8=1;

     }

 }

 

 GUI.Label(Rect(820,50,100,100),"=");

 GUI.Button(Rect(900,20,100,100),decimal.ToString());

 if(GUI.RepeatButton(Rect(1000,20,100,100),"answer1")){

     answer1=button1+button2+button3+button4+button5+button6+button7+button8;

     

 }

 

    //make sure that your time is based on when this script was first called

 //instead of when your game started

 var guiTime = Time.time - startTime;



 restSeconds = countDownSeconds - (guiTime);



 //display messages or whatever here -->do stuff based on your timer

 if (restSeconds <0) {

     countDownSeconds=10;

     startTime=Time.time;

     print ("Time is Over");

    

     //do stuff here

 }



 //display the timer

 roundedRestSeconds = Mathf.CeilToInt(restSeconds);

 displaySeconds = roundedRestSeconds % 60;

 displayMinutes = roundedRestSeconds / 60; 



 text = String.Format ("{0:00}:{1:00}", displayMinutes, displaySeconds); 

 GUI.Label(Rect(screenW-200,25,100,100), "nextline:");

 GUI.Label (Rect (screenW-100, 25, 100, 30), text);

}

function Awake() {

 startTime = Time.time;

}

I hope that you can help me.. thanks