const int blueLED = 4;
const int yellowLED = 5;
const int whiteLED = 6;
const int greenLED = 7;
void setup() {
  pinMode(blueLED,OUTPUT);
  pinMode(yellowLED,OUTPUT);
  pinMode(whiteLED,OUTPUT);
  pinMode(greenLED,OUTPUT);
}

void loop() {
  digitalWrite(blueLED,HIGH);
  digitalWrite(yellowLED,LOW);
  digitalWrite(whiteLED,LOW);
  digitalWrite(greenLED,LOW);
  delay(1500);
   digitalWrite(blueLED,LOW);
  digitalWrite(yellowLED,HIGH);
  digitalWrite(whiteLED,LOW);
  digitalWrite(greenLED,LOW);
  delay(1500);
  digitalWrite(blueLED,LOW);
  digitalWrite(yellowLED,LOW);
  digitalWrite(whiteLED,HIGH);
  digitalWrite(greenLED,LOW);
  delay(1500);
  digitalWrite(blueLED,LOW);
  digitalWrite(yellowLED,LOW);
  digitalWrite(whiteLED,LOW);
  digitalWrite(greenLED,HIGH);
  delay(1500);
   digitalWrite(blueLED,LOW);
  digitalWrite(yellowLED,LOW);
  digitalWrite(whiteLED,HIGH);
  digitalWrite(greenLED,LOW);
  delay(1500);
   digitalWrite(blueLED,LOW);
  digitalWrite(yellowLED,HIGH);
  digitalWrite(whiteLED,LOW);
  digitalWrite(greenLED,LOW);
  delay(1500);
   digitalWrite(blueLED,HIGH);
  digitalWrite(yellowLED,LOW);
  digitalWrite(whiteLED,LOW);
  digitalWrite(greenLED,LOW);
  delay(1500);

}