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

int main() {
    int n;
    cin >> n;
    long long a, b, c;
    cin >> a >> b >> c;
    cout << n / a + n / b + n / c - n / lcm(a, b) - n / lcm(b, c) - n / lcm(c, a) + n / lcm(a, lcm(b, c)) << endl;
}