#include <bits/stdc++.h>

using namespace std;

template<typename T>
T lcm(T a, T b) {
    if (a == 0 || b == 0) return 0;
    return (a * b) / __gcd(a, b);
}

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

    long long ans = n / a + n / b + n / c
                    - n / lcm(a, b) - n / lcm(b, c)
                    - n / lcm(c, a) + n / lcm(lcm(a, b), c);

    cout << ans << endl;
    return 0;
}