from machine import Pin as pin
from time import sleep
sleep(0.1) # Wait for USB to become ready

btn_1 = pin(0, pin.IN)
btn_2 = pin(1, pin.IN)
btn_3 = pin(2, pin.IN)
btn_enter = pin(3, pin.IN)

led = pin(14, pin.OUT)
counter = 0

while True:
    if (btn_1.value() == 0 and counter == 0):
        print('btn_1')
        counter +=1
        sleep(0.25)
    while btn_1.value() == 0:
        True
    sleep(0.25)
    if (btn_1.value() == 0 and counter != 0):
        counter = 0
        print('Fail')

    if (btn_2.value() == 0 and counter ==1):
        print('btn_2')
        counter +=1
        sleep(0.25)
    while btn_2.value() == 0:
        True
    sleep(0.25)
    if (btn_2.value() == 0 and counter != 1):
        counter = 0
        print('Fail')

    if (btn_3.value() == 0 and counter == 2):
        print('btn_3')
        counter +=1
        sleep(0.25)
    while btn_3.value() == 0:
        True
    sleep(0.25)
    if (btn_3.value() == 0 and counter != 2):
        counter = 0
        print('Fail')

    if btn_enter.value() == 0 and counter == 3:
        print('Success')
        led.value(1)
        sleep(5)
        led.value(0)
        counter = 0
        while btn_enter() == 0:
            True