#define LED_PINB3 PB3
#define LED_PINB5 PB5
#define LED_PINB10 PB10
#define LED_PINB4 PB4
#define BUTTON_PINPB6 PB6
#define BUTTON_PINPB8 PB8
#define BUTTON_PINPB9 PB9

void setup() {
  pinMode(BUTTON_PINPB6, INPUT_PULLUP);
  pinMode(BUTTON_PINPB8, INPUT_PULLUP);
  pinMode(BUTTON_PINPB9, INPUT_PULLUP);
  pinMode(LED_PINB3, OUTPUT);
  pinMode(LED_PINB4, OUTPUT);
  pinMode(LED_PINB5, OUTPUT);
  pinMode(LED_PINB10, OUTPUT);
}

void loop() {
  if (digitalRead(BUTTON_PINPB6) == LOW) {
    digitalWrite(LED_PINB3, HIGH);
    digitalWrite(LED_PINB4, LOW);
    digitalWrite(LED_PINB5, LOW);
    digitalWrite(LED_PINB10, HIGH);
  } if (digitalRead(BUTTON_PINPB8) == LOW) {
    digitalWrite(LED_PINB3, HIGH);
    digitalWrite(LED_PINB4, LOW);
    digitalWrite(LED_PINB5, LOW);
    digitalWrite(LED_PINB10, HIGH);
  } if (digitalRead(BUTTON_PINPB9) == LOW) {
    digitalWrite(LED_PINB3, HIGH);
    digitalWrite(LED_PINB4, LOW);
    digitalWrite(LED_PINB5, LOW);
    digitalWrite(LED_PINB10, HIGH);
  } 
  else {
    digitalWrite(LED_PINB3, LOW);
    digitalWrite(LED_PINB4, LOW);
    digitalWrite(LED_PINB5, HIGH);
    digitalWrite(LED_PINB10, LOW);
  }
}