Diode AND interrupt

int INT = 2;
int BTN1 = 6;
int BTN2 = 7;
volatile int count = 0;
volatile bool push = false;

void readBtn() {
  int b1 = digitalRead(BTN1);
  int b2 = digitalRead(BTN2);
  if (b1 == 0) {
    count++;
    digitalWrite(LED_BUILTIN, HIGH);
    push = true;
  }
  else if (b2 == 0) {
    count--;
    digitalWrite(LED_BUILTIN, LOW);
    push = true;
  }
  else {
    Serial.println("Glitch!");
  }
}

void setup() {
  // put your setup code here, to run once:
  pinMode(INT, INPUT);
  pinMode(BTN1, INPUT);
  pinMode(BTN2, INPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(INT), readBtn, FALLING);
  Serial.begin(9600);
  count = 0;
  push = false;
}

void loop() {
  // put your main code here, to run repeatedly:
  if (push) {
    Serial.print("Counter: ");
    Serial.println(count);
    push = false;
  }
}