from machine import Pin 
from utime import sleep
led = Pin(2, Pin.OUT)
try:
    f=int(input("enter an integer between 1 and 24 \t"))
    if(1<=f<=24):
        while True:
            led.on()
            sleep(1/(2*f))
            led.off()
            sleep(1/(2*f))
    else:
        print("The number you entered is out of range")
except ValueError:
    print("Invalid input. Please enter an integer")