#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq


def input():
    return sys.stdin.readline()[:-1]


# sys.setrecursionlimit(1000000)

# _INPUT = """100
# 2 3 5
# """
# sys.stdin = io.StringIO(_INPUT)

def lcm(n1, n2):
    return n1 * n2 // math.gcd(n1, n2)

N = int(input())
a, b, c = map(int, input().split())
ans = N//a + N//b + N//c - N//lcm(a,b) - N//lcm(b,c) - N//lcm(a,c) + N//lcm(a,lcm(b,c))
print(ans)