#include <bits/stdc++.h>
using namespace std;

#define int long long

typedef vector<int> vi;
typedef pair<int, int> pi;
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define popcount __builtin_popcountll
const int MOD = 1e9 + 7;

void swapp(int &a, int &b) {
    a = a ^ b;
    b = a ^ b;
    a = a ^ b;
}

int mul(int a, int b) {
    if (log10l(a) + log10l(b) > 18.3) return 3e18;
    return a * b;
}

#define forn(i, a, b) for (int i = a; i < b; i++)

bool comp(pair<int, int> a, pair<int, int> b) {
    if (a.first == b.first) {
        return a.second > b.second;
    }
    return a.first < b.first;
}

void solve() {
    int ta ; 
    cin >> ta; 
    int a,b,c;
    cin >> a>> b >> c; 
    int cnt = 0 ;
    cnt = ta/a + ta/b + ta/c - ta/(a*b) - ta /(a*c) - ta/(b*c) + ta/(a*b*c);
    cout<<cnt<<"\n";
}

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
    }
    return 0;
}