#!/usr/bin/python
import threading
import sys

average_result = None
minimum_result = None
maximum_result = None

def calculate_average(numbers: list):
    global average_result
    average_result = sum(numbers) / len(numbers)

def calculate_minimum(numbers: list):
    global minimum_result
    minimum_result = min(numbers)

def calculate_maximum(numbers: list):
    global maximum_result
    maximum_result = max(numbers)

def main() -> int:
    if len(sys.argv) == 1:
        print('Error: One or many integer arguments are necessary.')
        return 1

    # Converting digit strings into integers
    numbers = None
    try:
        numbers = [int(digit) for digit in sys.argv[1:]]
    except:
        print('Error: Every argument must be an integer.')
        return 1

    # Creating threads
    average_thread = threading.Thread(target=calculate_average, args=(numbers,))
    minimum_thread = threading.Thread(target=calculate_minimum, args=(numbers,))
    maximum_thread = threading.Thread(target=calculate_maximum, args=(numbers,))
  
    # Starting the threads
    average_thread.start()
    minimum_thread.start()
    maximum_thread.start()

    # Waiting for the threads
    average_thread.join()
    minimum_thread.join()
    maximum_thread.join()
  
    # Printing the results
    global average_result, minimum_result, maximum_result
    print('The average value is %d' % average_result)
    print('The minimum value is %d' % minimum_result)
    print('The maximum value is %d' % maximum_result)
    return 0

if __name__ == '__main__':
    exit(main())