#include <iostream>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    long long n;
    cin >> n;

    long long a, b, c;
    cin >> a >> b >> c;

    int f = 0;

    for (long long i = 1; i <= n; i++)
    {
        if (i % a == 0 || i % b == 0 || i % c == 0)
        {
            f++;
        }
    }

    cout << f << endl;
}