#include <iostream>
#include <algorithm>

using namespace std;
typedef long long ll;

ll lcm(ll x, ll y) {
    return x * y / __gcd(x, y);
}

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

    ll ret = n / a + n / b + n / c;
    ret -= n / lcm(a, b) + n / lcm(b, c) + n / lcm(c, a);
    ret += n / lcm(lcm(a, b), c);
    cout << ret << endl;
    return 0;
}