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

#define ll long long
#define ull unsigned long long
#define ld long double
#define PI 3.1415926535897932384626433832795l
#define pb push_back
#define forn(i, a, n) for (int i = a; i < n; i++)
#define forrn(i, a, n) for (int i = n - 1; i >= a; i--)
#define inputArr(arr) forn(i, 0, arr.size()) cin >> arr[i]
#define inputArrRange(arr, a, b) forn(i, a, b) cin >> arr[i]
#define printArr(arr) forn(i, 0, arr.size()) cout << arr[i] << " "
#define printArrRange(arr, a, b) forn(i, a, b) cout << arr[i] << " "
#define sz(a) a.size()
#define all(ans) ans.begin(), ans.end()
#define lcm(a, b) (a * b) / __gcd(a, b)
#define gcd(a, b) __gcd(a, b)
#define um unordered_map
#define mp make_pair
#define here cout << "here" << endl;
#define print(ans) cout << ans
#define nl cout << endl;
#define min_heap(T) priority_queue<T, vector<T>, greater<T>>
#define max_heap(T) priority_queue<T>

typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<char> vc;
typedef vector<vc> vvc;
typedef vector<string> vs;
typedef vector<vs> vvs;
typedef vector<bool> vb;

void solve()
{
    ll int n, a, b, c;
    cin >> n >> a >> b >> c;
    cout << n / a + n / b + n / c - n / (lcm(a, b)) - n / (lcm(a, c)) - n / (lcm(b, c)) + n / (lcm(a, lcm(b, c))) << endl;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int tc = 1;
    // cin >> tc;
    for (int t = 1; t <= tc; t++)
    {
        solve();
    }
}