int COUNT=0;
int LED=3;
int IN=5;
int OUT=6;
void setup() {
  // put your setup code here, to run once:
  pinMode(LED,OUTPUT);
pinMode(IN,INPUT);
pinMode(OUT, INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
if(digitalRead(IN)==1)
{
  COUNT++;
  Serial.print("PERSON IS IN THE ROOM");
  Serial.print(COUNT);
  digitalWrite(LED,HIGH);
}
else
(digitalRead(OUT)==1);
{
 COUNT--;
  Serial.print("PERSON IS OUT OF THE ROOM");
  Serial.print(COUNT);
  digitalWrite(LED, LOW);
}
}