Problem 5. (Counting Primes) Write a program prime_counter.py that takes an integer N as command-line argument and writes the number of primes less than or equal to N. Note that if you are not careful about the upper bound of the loop that tests for the primality of a number, your program may not nish in a reasonable amount of time. Hint: a number i is prime if it is not divisible by any number j [2,i].

$ python3 prime_counter.py 1000

168