int pinLED1 = 23;
int pinLED2 = 15;
int pinLED3 = 22;

void setup() {
pinMode(pinLED1, OUTPUT);
pinMode(pinLED2, OUTPUT);
pinMode(pinLED3, OUTPUT);
}

void loop() {
  digitalWrite(pinLED1, HIGH);
  delay(3500);
  digitalWrite(pinLED1, LOW);
  delay(1500);

  digitalWrite(pinLED2, HIGH);
  delay(1500);
  digitalWrite(pinLED2, LOW);
  delay(1000);

  digitalWrite(pinLED3, HIGH);
  delay(3000);
  digitalWrite(pinLED3, LOW);
  delay(500);
}