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

using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) (int)(x).size()
ll gcd(ll a, ll b) { return (b == 0 ? a : gcd(b, a % b)); }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }

int main() {
    ll N, a, b, c;
    cin >> N >> a >> b >> c;
    ll ans = 0;
    ans += N / a + N / b + N / c;
    ans -= N / lcm(a, b) + N / lcm(b, c) + N / lcm(a, c);
    ans += N / lcm(a, lcm(b, c));
    cout << ans << endl;
    return 0;
}