/* -*- coding: utf-8 -*-
 *
 * 316.cc: No.316 もっと刺激的なFizzBuzzをください - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

typedef long long ll;

/* global variables */

/* subroutines */

inline ll lcm(ll a, ll b) { return a * b / __gcd(a, b); }

/* main */

int main() {
  ll n, a, b, c;
  cin >> n >> a >> b >> c;

  ll ab = lcm(a, b);
  ll bc = lcm(b, c);
  ll ca = lcm(c, a);
  ll abc = lcm(a, bc);

  ll ans = n / a + n / b + n / c - n / ab - n / bc - n / ca + n / abc;
  printf("%lld\n", ans);
  return 0;
}