#include <iostream>
#include <algorithm>
using namespace std;
long long lcm(long long x, long long y)
{
    return (x / __gcd(x, y)) * y;
}
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;

    int a1 = n / a;
    int a2 = n / b;
    int a3 = n / c;

    int q = n / lcm(a, b);
    int w = n / lcm(b, c);
    int t = n / lcm(c, a);
    int r = n / lcm(a, lcm(b, c));
    int cc = a1 + a2 + a3 - q - w - t + r;
    cout << cc << endl;
}