from machine import Pin
import time

class LED:
    def __init__(self, pin_number):
        self.led = Pin(pin_number, Pin.OUT)
    
    def on(self):
        self.led.value(1)
    
    def off(self):
        self.led.value(0)

if __name__ == "__main__":
    pin = int(input("Enter pin number: "))
    led = LED(pin)
    
    while True:
        led.on()
        time.sleep(0.5)
        led.off()
        time.sleep(0.5)