#define LED1 7
#define LED2 6
#define LED3 5
#define LED4 4

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);

}

void loop() {
digitalWrite(LED1, HIGH);
delay(200);
digitalWrite(LED1, LOW);
delay(200);
digitalWrite(LED2, HIGH);
delay(200);
digitalWrite(LED2,LOW);
delay(200);
digitalWrite(LED3, HIGH);
delay(200);
digitalWrite(LED3, LOW);
delay(200);
digitalWrite(LED4, HIGH);
delay(200);
digitalWrite(LED4, LOW);
delay(200);

}