#include <bits/stdc++.h>

using namespace std;

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


    long long Ca = N/a;
    long long Cb = N/b;
    long long Cc = N/c;

    long long Cab = N/lcm(a, b);
    long long Cbc = N/lcm(b, c);
    long long Cac = N/lcm(a, c);
    long long Cabc = N/lcm(a, lcm(b, c));

    long long result = Ca + Cb + Cc - Cab - Cbc - Cac + Cabc;

    cout << result << endl;

    return 0;
}