// constants won't change. They're used here to set pin numbers:
const int buttonPin = 2;  // the number of the pushbutton pin
const int ledhijau = 4;    // the number of the LED pin
const int ledmerah = 3;    // the number of the LED pin

// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status

void setup() {
  pinMode(ledhijau, OUTPUT);
  pinMode(ledmerah, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:

  for(int i=0; i<=5; i++){
    digitalWrite(ledmerah, HIGH);
    delay(1000);
    digitalWrite(ledmerah, LOW);
    delay(1000);
  }

  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    // turn LED on:
    digitalWrite(ledhijau, HIGH);
  } else {
    // turn LED off:
    digitalWrite(ledhijau, LOW);
  }
}