//
//  main.cpp
//  ProCon
//
//  Created by hashimotoryoma on 2017/08/20.
//  Copyright © 2017年 hashimotoryoma. All rights reserved.
//


#include <iostream>
#include <fstream>
#include <algorithm>

using namespace std;

typedef long long ll;

ll N;
ll a,b,c;
ll ans;

ll gcd(ll x,ll y){
    return y==0? x:gcd(y,x%y);
}

ll lcm(ll x,ll y){
    return x*y/gcd(x,y);
}

int main() {
    // insert code here...    return 0;
  //////
    // input from txt
    /*
    std::ifstream in("input.txt");
    std::cin.rdbuf(in.rdbuf());
    std::ofstream out("output.txt");
    std::cout.rdbuf(out.rdbuf());
   ///////
     */
    cin >> N;
    cin >> a >> b >> c;
    
    ll ablcm = lcm(a,b);
    ans = N/a+N/b+N/c-N/ablcm-N/lcm(b,c)-N/lcm(c,a)+N/lcm(ablcm,c);
    cout << ans << endl;
    
    return 0;
}