Bus People Counter Project using IR sensors

// IR Obstacle Collision Detection Module - Henry's Bench
// Bus People Counter - Dawaerstore.com
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x3F, 20, 4);

int buzzerPin = 9;
int isObstaclePin = 2;
int isObstaclePin3 = 5;

int isObstacle = HIGH;
int isObstacle3 = HIGH;

int a = 0;
int d = 0;
int count = 0;

void setup() {

  pinMode(isObstaclePin, INPUT);
  pinMode(isObstaclePin3, INPUT);
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin,1);
  Serial.begin(9600);
  Wire.begin();
  lcd.begin();
  lcd.home();
  lcd.setCursor(0, 0);
  lcd.print(" Scanning...    ");

}

void loop() {
  isObstacle = digitalRead(isObstaclePin);
  isObstacle3 = digitalRead(isObstaclePin3);

  if (isObstacle == LOW)
  {
    a = 1;

  }
  else if (isObstacle3 == LOW)
  {
    d = 1;
  }

  calc();


}


void calc() {
  if (a == 1) {
    count = count + 1;
    digitalWrite(buzzerPin,1);
    a = 0;
    Serial.println(count);
    lcd.setCursor(0, 0);
    lcd.print("                ");
    lcd.setCursor(0, 0);
    lcd.print(count);
    delay(700);
  }
  else if (d == 1) {
    if (count == 2){digitalWrite(buzzerPin,0);}
    else{digitalWrite(buzzerPin,1);}
    count = count - 1;
    d = 0;
    Serial.println(count);
    lcd.setCursor(0, 0);
    lcd.print("                ");
    lcd.setCursor(0, 0);
    lcd.print(count);
    delay(700);

  }
}