#define LED1 10
#define LED2 9
#define LED3 8




void setup() 
{
  // put your setup code here, to run once:
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);

}

void loop() 
{
  // put your main code here, to run repeatedly:

  digitalWrite(LED3, LOW);
  digitalWrite(LED1, HIGH);
  delay(300);
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);
  delay(300);
  digitalWrite(LED2, LOW);
  digitalWrite(LED3, HIGH);
  delay(300);

}