#include <iostream>
using namespace std;

int gcd(int a, int b) {
    if (a == b) return a;
    if (a > b) {
        return gcd(a - b, b);
    } else {
        return gcd(a, b - a);
    }
}


int lcm(int a, int b) {
    return (a * b) / gcd(a, b);
}

int main() {
    int n, a, b, c;
    cin >> n >> a >> b >> c;

    int ans = n / a + n / b + n / c
              - n / lcm(a, b) - n / lcm(b, c) - n / lcm(c, a)
              + n / lcm(lcm(a, b), c);
    cout << ans << endl;
    return 0;
}