int Buup = 6;
int Budp = 5;

int Bbup = 4;
int Bbdp = 3;

int Bep = 8;

int Sup = 10;
int Sbp = 9;

int Buu, Bud, Bbu, Bbd, Be, Su, Sb;

int redLED = 12;
int greenLED = 13;


void setup() 
{
  Serial.begin(9600);
  
  pinMode(Buup, INPUT_PULLUP);
  pinMode(Budp, INPUT_PULLUP);
  pinMode(Bbup, INPUT_PULLUP);
  pinMode(Bbdp, INPUT_PULLUP);
  pinMode(Bep,  INPUT_PULLUP);
  pinMode(Sup,  INPUT_PULLUP);
  pinMode(Sbp,  INPUT_PULLUP);

  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);

}

void loop() 
{
  Buu = !digitalRead(Buup); 
  Bud = !digitalRead(Budp); 
  Bbu  = !digitalRead(Bbup); 
  Bbd = !digitalRead(Bbdp); 
  Be = !digitalRead(Bep); 
  Su = !digitalRead(Sup); 
  Sb = !digitalRead(Sbp); 

  //Serial.println(Buu);
  //delay(500);

  if(!Su && (Bbu == 1 || Buu == 1) && (Be + Bud + Bbd == 0))
	{
		digitalWrite(redLED, HIGH);
	}
  	else
	{
		if(Be == 0)//emergency not pressed
		{
			if(!Sb)//Not in the bottom floor
			{
				if((Buu == 0) && (Bbu == 0))			 //Upward pushbuttons in up or bottom floors were not pressed
				{
					if(Bud == 1 || Bbd == 1) //Downward pushbutton in up or bottom floors was pressed
					{
						digitalWrite(greenLED, HIGH);
					}
          else
          {
            digitalWrite(greenLED, LOW);
            digitalWrite(redLED, LOW);

          }			
				}
			}
		}
	}


}