import digitalio
import board
import time
led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT
while True:
    k = 0
    while k < 3:
        led.value = True
        time.sleep(0.5)
        led.value = False
        time.sleep(0.5)
        k = k + 1
    time.sleep(0.5)