void setup() {
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6,INPUT_PULLUP);
  pinMode(7, INPUT_PULLUP);

}

void loop() {
  if
  (digitalRead(4) == LOW) {
    digitalWrite(12, HIGH);
  } else {
    digitalWrite(12, LOW);
  }

  if
  (digitalRead(5) == LOW) {
    digitalWrite(11, HIGH);
  } else {
    digitalWrite(11, LOW);
  }

  if
  (digitalRead(6)== LOW) {
  digitalWrite(10, HIGH);
  } else {
    digitalWrite(10, LOW);
  }

  if
  (digitalRead(7)== LOW) {
    digitalWrite(12, HIGH);
  } else {
    digitalWrite(12, LOW);
  }

  if
  (digitalRead(7)== LOW) {
    digitalWrite(11, HIGH);
  } else {
    digitalWrite(11, LOW);
  }

  if
  (digitalRead(7)== LOW) {
    digitalWrite(10, HIGH);
  } else {
    digitalWrite(10, LOW);
  }

  if
  (digitalRead(7)== LOW) {
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(12, HIGH);
  } else {
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
    digitalWrite(12, LOW);
  }
  }