#include <iostream>
using namespace std;

using ll = long long;

ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return (a / gcd(a, b)) * b; }
ll count(ll n, ll x) { return n / x; }

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

    ll ab = lcm(a, b), bc = lcm(b, c), ac = lcm(a, c), abc = lcm(ab, c);

    ll result = (count(n, a) + count(n, b) + count(n, c))
                - (count(n, ab) + count(n, bc) + count(n, ac))
                + count(n, abc);

    cout << result << endl;
}