#include <bits/stdc++.h>
using namespace std;

int main()
{
    long long N, a, b, c;
    cin >> N >> a >> b >> c;
    long long ans = N / a + N / b + N / c;
    ans -= N / lcm(a, b);
    ans -= N / lcm(a, c);
    ans -= N / lcm(b, c);
    ans += N / lcm(a, lcm(b, c));
    cout << ans;
}