#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main() {
    ll N, a, b, c;
    cin >> N >> a >> b >> c;

    ll A = N / a;
    ll B = N / b;
    ll C = N / c;

    ll AB = N / lcm(a, b);
    ll BC = N / lcm(b, c);
    ll CA = N / lcm(c, a);

    ll ABC = N / lcm(lcm(a, b), c);

    ll ans = A + B + C - AB - BC - CA + ABC;

    cout << ans << endl;    

    return 0;
}