#!/usr/bin/python3
#
# A program that takes an integer N > 0 as a command-line parameter,
# and prints the values of \pi(i) for all i <= N, where \pi(k) is the
# number of prime numbers between 1 and k
#
import sys

def pi(n):
    # Write your code here:


try:
    pi(int(sys.argv[1]))
except:
    print('usage:', sys.argv[0], '<n>')