#include <iostream>
using namespace std;

#define int long long

int GCD(int a, int b) {
    if (b == 0) return a;
    else return GCD(b, a % b);
}

int LCM(int a, int b) {
    return a / GCD(a, b) * b;
}

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

    int ab = LCM(a, b), bc = LCM(b, c), ca = LCM(c, a),
        abc = LCM(a, LCM(b, c));

    ans = N / a + N / b + N / c - (N / ab + N / bc + N / ca) + N / abc;
    cout << ans << endl;

    return 0;
}