#include <bits/stdc++.h>

using namespace std;

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

    int 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;
}