function setLed(n) {
  LED1.write(n === 1);
  LED2.write(n === 2);
  LED3.write(n === 3);
}

function blinkCount(n) {
  if (n === 0) {
    n = 5;
  }

  var led = 0;
  var count = n;
  var interval = setInterval(function() {
    led = (led + 1) % 4;
    setLed(led);

    if (led === 0) {
      count -= 1;
    }

    if (count === 0) {
      clearInterval(interval);

      setTimeout(function() {
        blinkCount(n - 1);
      }, 1000);
    }
  }, 200);
}

blinkCount(0);