const int numLEDs = 3;
int Pins[] = {10, 9, 8};
int delayTime = 500;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  for (int ito = 0; ito < numLEDs; ito++) {
    pinMode(Pins[ito], OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available()){
    String perintah = Serial.readStringUntil('\n');
    if(perintah == "go"){
      for(int z = 0; z <= 100; z++){
        for (int ito = 0; ito < numLEDs; ito++) {
          digitalWrite(Pins[ito], HIGH);
          delay(delayTime);
          digitalWrite(Pins[ito], LOW);
          delay(delayTime);
        }
      } 
    }
  }
  Serial.print(" ");
}