#define LED1 8
#define LED2 9
#define LED3 10
#define LED4 11



void setup() {
  pinMode (LED1, OUTPUT);
  pinMode (LED2, OUTPUT);
  pinMode (LED3, OUTPUT);
  pinMode (LED4, OUTPUT);

}

void loop() {
  digitalWrite(LED1, HIGH);
  delay(1000);
  digitalWrite(LED2, HIGH);
  delay(1000);
  digitalWrite(LED3, HIGH);
  delay(1000);
  digitalWrite(LED4, HIGH);
  delay(1000);
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED3, LOW);
  digitalWrite(LED4, LOW);
  delay(1000);

}