/*
    Author:zeke
    
    pass System Test!
    GET AC!!
*/
#include <iostream>
#include <queue>
#include <vector>
#include <iostream>
#include <vector>
#include <string>
#include <cassert>
#include <algorithm>
#include <functional>
#include <cmath>
#include <queue>
#include <set>
#include <stack>
#include <deque>
#include <map>
#include <iomanip>
#include <utility>
#include <stack>
using ll = long long;
using ld = long double;
using namespace std;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
#define rep3(var, min, max) for (ll (var) = (min); (var) < (max); ++(var))
#define repi3(var, min, max) for (ll (var) = (max) - 1; (var) + 1 > (min); --(var))
#define Mp(a,b) make_pair((a),(b))
#define F first
#define S second
#define Icin(s) ll (s);cin>>(s);
#define Scin(s) ll (s);cin>>(s);
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
typedef pair<ll, ll> P;
typedef vector<ll> V;
typedef vector<V> VV;
typedef vector<P> VP;
ll MOD = 1e9 + 7;
ll INF =1e18;
long long GCD(long long a,long long b){
    if(b==0)return a;
    return GCD(b,a%b);
}
long long LCM(long long a,long long b){
    return a*b/GCD(a,b);
}
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
   // ll cou=0;
    ll n;
    cin>>n;
    ll a,b,c;
    cin>>a>>b>>c;
    ll k=n/a;
    ll m=n/b;
    ll N=n/c;
    ll o=n/LCM(a,b);
    ll p=n/LCM(c,b);
    ll q=n/LCM(a,c);
    ll r=n/LCM(LCM(a,b),c);
    //cout<<k<<endl;
    ll result=k+m+N-o-p-q+r;
    cout<<result<<endl;
}