int LED = 12;
int LED1 = 11;
int LED2 = 10;

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

void loop() {
  digitalWrite(LED, HIGH);
  delay(1000);
  digitalWrite(LED, LOW);
  delay(1000);

    digitalWrite(LED2, HIGH);
  delay(1000);
  digitalWrite(LED2, LOW);
  delay(1000);

    digitalWrite(LED1, HIGH);
  delay(1000);
  digitalWrite(LED1, LOW);
  delay(1000);
}