import time
from machine import Pin,Timer
time.sleep(0.1)
# Wait for USB to become ready
LED=Pin(0,Pin.OUT)
timer=Timer()
def flash_LED(timer):
    global LED
    LED.toggle()
while True:
  timer.init(freq=10.5,mode=Timer.PERIODIC,callback=flash_LED)
  timer.init(freq=2.5,mode=Timer.PERIODIC,callback=flash_LED)
  timer.init(freq=3.5,mode=Timer.PERIODIC,callback=flash_LED)
  timer.init(freq=4.5,mode=Timer.PERIODIC,callback=flash_LED)
print("Hello, Pi Pico!")