#define LED1 2
#define LED2 4
#define LED3 5

void setup() {
  pinMode(LED1,OUTPUT);
  pinMode(LED2,OUTPUT);
  pinMode(LED3,OUTPUT);
  
}

void loop() {
  digitalWrite(LED1,HIGH);
  digitalWrite(LED2,LOW);
  digitalWrite(LED3,LOW);
  delay(500);
  digitalWrite(LED1,LOW);
  digitalWrite(LED2,HIGH);
  delay(500);
  digitalWrite(LED2,LOW);
  digitalWrite(LED3,HIGH);
  delay(500);
}