Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(4100000)

import math

import logging

logging.basicConfig(level=logging.DEBUG)

logger = logging.getLogger(__name__)

import numpy as np


def resolve():
    # S = [x for x in sys.stdin.readline().split()][0]  # 文字列 一つ
    N = [int(x) for x in sys.stdin.readline().split()][0]  # int 一つ
    # N, D = [int(x) for x in sys.stdin.readline().split()]  # 複数int
    a_list = [int(x) for x in sys.stdin.readline().split()]  # 複数int

    # grid = [list(sys.stdin.readline().split()[0]) for _ in range(N)]  # 文字列grid
    # v_list = [int(sys.stdin.readline().split()[0]) for _ in range(N)]
    # grid = [[int(x) for x in sys.stdin.readline().split()]
    #         for _ in range(N)]  # int grid

    logger.debug('{}'.format([]))

    MAX = 10**6
    count_list = np.array([0 for _ in range(1, MAX + 1)])
    for a in a_list:
        count_list[a] += 1

    for i in range(1, int(np.floor(np.sqrt(MAX))) + 1):
        if count_list[i]:
            count_list[i * 2::i] = 0
            if count_list[i] >= 2:
                count_list[i] = 0

    print(count_list.sum())


if __name__ == "__main__":
    resolve()

# AtCoder Unit Test で自動生成できる, 最後のunittest.main は消す
# python -m unittest template/template.py で実行できる
# pypy3 -m unittest template/template.py で実行できる

import sys
from io import StringIO
import unittest


class TestClass(unittest.TestCase):
    def assertIO(self, input, output):
        stdout, stdin = sys.stdout, sys.stdin
        sys.stdout, sys.stdin = StringIO(), StringIO(input)
        resolve()
        sys.stdout.seek(0)
        out = sys.stdout.read()[:-1]
        sys.stdout, sys.stdin = stdout, stdin
        self.assertEqual(out, output)

    def test_入力例_1(self):
        input = """5
24 11 8 3 16"""
        output = """3"""
        self.assertIO(input, output)

    def test_入力例_2(self):
        input = """4
5 5 5 5"""
        output = """0"""
        self.assertIO(input, output)

    def test_入力例_3(self):
        input = """10
33 18 45 28 8 19 89 86 2 4"""
        output = """5"""
        self.assertIO(input, output)


Fixed submission:
import sys
sys.setrecursionlimit(4100000)

import math

import logging

logging.basicConfig(level=logging.DEBUG)

logger = logging.getLogger(__name__)

import numpy as np


def resolve():
    # S = [x for x in sys.stdin.readline().split()][0]  # 文字列 一つ
    N = [int(x) for x in sys.stdin.readline().split()][0]  # int 一つ
    # N, D = [int(x) for x in sys.stdin.readline().split()]  # 複数int
    a_list = [int(x) for x in sys.stdin.readline().split()]  # 複数int

    # grid = [list(sys.stdin.readline().split()[0]) for _ in range(N)]  # 文字列grid
    # v_list = [int(sys.stdin.readline().split()[0]) for _ in range(N)]
    # grid = [[int(x) for x in sys.stdin.readline().split()]
    #         for _ in range(N)]  # int grid

    logger.debug('{}'.format([]))

    MAX = 10**6
    count_list = np.array([0 for _ in range(MAX + 1)])
    for a in a_list:
        count_list[a] += 1

    for i in range(1, MAX + 1):
        if count_list[i]:
            count_list[i * 2::i] = 0
            if count_list[i] >= 2:
                count_list[i] = 0

    print(count_list.sum())


if __name__ == "__main__":
    resolve()

# AtCoder Unit Test で自動生成できる, 最後のunittest.main は消す
# python -m unittest template/template.py で実行できる
# pypy3 -m unittest template/template.py で実行できる

import sys
from io import StringIO
import unittest


class TestClass(unittest.TestCase):
    def assertIO(self, input, output):
        stdout, stdin = sys.stdout, sys.stdin
        sys.stdout, sys.stdin = StringIO(), StringIO(input)
        resolve()
        sys.stdout.seek(0)
        out = sys.stdout.read()[:-1]
        sys.stdout, sys.stdin = stdout, stdin
        self.assertEqual(out, output)

    def test_入力例_1(self):
        input = """5
24 11 8 3 16"""
        output = """3"""
        self.assertIO(input, output)

    def test_入力例_2(self):
        input = """4
5 5 5 5"""
        output = """0"""
        self.assertIO(input, output)

    def test_入力例_3(self):
        input = """10
33 18 45 28 8 19 89 86 2 4"""
        output = """5"""
        self.assertIO(input, output)

    def test_入力例_4(self):
        input = """2
1000000 1000000"""
        output = """0"""
        self.assertIO(input, output)