import machine 
import utime

BUTTON=machine.Pin(16,machine.Pin.IN)
LED=machine.Pin(18,machine.Pin.OUT)

val=0

while 2020:
    if BUTTON.value()==1:
        val=val+1
        utime.sleep(1)
    elif val==2:
        val=0
        utime.sleep(2)
    LED.value(val)