import time
from machine import Pin
led1=Pin(14,Pin.OUT)
led2=Pin(4,Pin.OUT)
led3=Pin(2,Pin.OUT)
while True:
  led1.value(1)
  time.sleep(3)
  led1.value(0)
  time.sleep(1)
  led2.value(1)
  time.sleep(3)
  led2.value(0)
  time.sleep(1)
  led3.value(1)
  time.sleep(3)
  led3.value(0)
  time.sleep(1)