void setup() {
  // put your setup code here, to run once:
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(2, HIGH);  //piros be
delay(5000);

digitalWrite(3, HIGH);  //sárga be
delay(2000);

digitalWrite(3, LOW); //sárga ki
digitalWrite(2, LOW); //piros ki
digitalWrite(4, HIGH);  //zöld be
delay(5000);

digitalWrite(4, LOW); //zöld ki
digitalWrite(3, HIGH);  //sárga be
delay(2000);

digitalWrite(3, LOW); //sárga ki
}