void setup() {
  Serial.begin(9600);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  
}

void loop() {
  int c = analogRead(A0);
  Serial.print(c);

  if(c>500){digitalWrite(3,1);
  delay(500);
  digitalWrite(4,1);
  digitalWrite(3,0);
  delay(500);
  digitalWrite(5,1);
  digitalWrite(4,0);
  delay(500);
  digitalWrite(5,0);
  }
  if(c<500){digitalWrite(5,1);
  delay(500);
  digitalWrite(4,1);
  digitalWrite(5,0);
  delay(500);
  digitalWrite(3,1);
  digitalWrite(4,0);
  delay(500);
  digitalWrite(3,0);
  }
   
}