#include <iostream>
using namespace std;
int main() {
    int n, a, b, c; cin >> n >> a >> b >> c;
    int ans = 0;
    do {
        if (n % a == 0 or n % b == 0 or n % c == 0) ++ ans;
    } while (-- n);
    cout << ans << endl;
    return 0;
}