int button_st = 0;
int button = 8;
	 
int l_red = 6;
int l_yellow = 4;
int l_green = 2;
	 
void setup()
{
pinMode(button, INPUT);

pinMode(l_red, OUTPUT);
pinMode(l_yellow, OUTPUT);
pinMode(l_green, OUTPUT);
}
	 
void loop()
{
button_st = digitalRead (button);
	   
if (button_st == 1)
{
digitalWrite(l_red, 1);
delay(1000);
digitalWrite(l_yellow, 1);
delay(1000);
digitalWrite(l_green, 1);
delay(1000);
	  } 
else 
	  {
	    digitalWrite(l_red, 0);
	    digitalWrite(l_yellow, 0);
	    digitalWrite(l_green, 0);
	  }
	}