void setup() {
  Serial.begin(57600);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);
  pinMode(7, INPUT_PULLUP);
  pinMode(8, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
}

void loop() {
  byte inputs = 0;
  if (digitalRead(2)) inputs += 1;
  if (digitalRead(3)) inputs += 2;
  if (digitalRead(4)) inputs += 4;
  if (digitalRead(5)) inputs += 8;
  if (digitalRead(6)) inputs += 16;
  if (digitalRead(7)) inputs += 32;
  if (digitalRead(8)) inputs += 64;
  if (digitalRead(9)) inputs += 128;
  
  Serial.println(inputs);

  delay(1000);

}