void setup() {
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, INPUT);

}

void loop() {
  if (digitalRead(4) == HIGH)
  {digitalWrite(1, HIGH);}
  else if (digitalRead(5) == HIGH && digitalRead(6) == HIGH)
{digitalWrite(2, HIGH);
digitalWrite(3, LOW);
delay(500);
digitalWrite(2, LOW);
digitalWrite(3, HIGH);
delay(500);}
else {digitalWrite(1, LOW);
digitalWrite(2, LOW);
digitalWrite(3, LOW);}
}