#include <bits/stdc++.h>
#define I first
#define II second
#define ii pair<int, int>
#define ll long long
using namespace std;
const long long P = 1e9 + 7;
const int N = 1e6 + 10;
const long long INF = 1e18;

void input()
{
#define TASKNAME ""
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if (fopen(TASKNAME ".inp", "r"))
    {
        freopen(TASKNAME ".inp", "r", stdin);
        freopen(TASKNAME ".out", "w", stdout);
    }
}
ll a, b, c, t,n;
ll lcm(ll x, ll y)
{
    return x/__gcd(x, y)*y;
}
ll dem(ll x, ll a, ll b, ll c)
{
    if (x <= 0)
        return 0;
    ll res = x/a+x/b+x/c+x/(lcm(lcm(a, b), c))-x/(lcm(a, b))-x/(lcm(b, c))-x/(lcm(a, c));
    return res;
}
int main()
{
    input();
    cin >> n >> a >> b >> c;
    ll l = 1,r=n;
     cout << dem(r, a, b, c)-dem(l-1, a, b, c);
    return 0;
}