void setup() {
  // put your setup code here, to run once:
  pinMode(3, OUTPUT);
   pinMode(4, OUTPUT);
    pinMode(5, OUTPUT);
     pinMode(A0, INPUT);

}
void loop() {
  // put your main code here, to run repeatedly:
if(analogRead(A0)>500)
{
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);

}
else
{
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
}

delay(1000);
}