#define LED 5

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode ( LED, OUTPUT );
}

void loop() {
  int i = 0;
  while ( i < 3 ) {
    Serial.println (i);
    digitalWrite ( LED, HIGH );
    delay (300);
    digitalWrite ( LED, LOW );
    delay (300);
    i++; // i += 1; // i = i + 1
  }
  Serial.println ("Pause!");
  delay (1000);
}