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

long long lcm(int a, int b, int c) {
    int g = __gcd(a, b);
    long long l = 1ll * a / g * b;
    long long g2 = __gcd(l, (long long) c);
    return l / g2 * c;

}

int main() {
    int n;
    cin >> n;
    int a, b, c;
    cin >> a >> b >> c;
    cout << (n / a + n / b + n / c - n / (1ll * a * b / __gcd(a, b)) - n / (1ll * b * c / __gcd(a, b)) - n / (1ll * c * a / __gcd(c, a)) + n / lcm(a, b, c)) << endl;
}