#define LED_1 2
#define LED_2 4 
#define LED_3 5
#define LED_4 18 
#define BUZ 23

void setup() {
  pinMode(LED_1, OUTPUT);
  pinMode(LED_2, OUTPUT);
  pinMode(LED_3, OUTPUT);
  pinMode(LED_4, OUTPUT);
  pinMode(BUZ, OUTPUT);
}

void loop() {
digitalWrite(LED_1, HIGH);
digitalWrite(LED_2, LOW);
digitalWrite(LED_3, HIGH);
digitalWrite(LED_4, LOW);
digitalWrite(BUZ, HIGH);
delay(1000);

digitalWrite(LED_1, LOW);
digitalWrite(LED_2, HIGH);
digitalWrite(LED_3,LOW);
digitalWrite(LED_4, HIGH);
digitalWrite(BUZ, LOW);
delay(1000);

}