#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
inline long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a; }
inline long long lcm(long long a, long long b) { return a / gcd(a, b) * b; }

int main() {
    long long n; cin >> n;
    int a, b, c; cin >> a >> b >> c;
    long long na = n / a;
    long long nb = n / b;
    long long nc = n / c;
    long long nab = n / lcm(a, b);
    long long nbc = n / lcm(b, c);
    long long nca = n / lcm(c, a);
    long long nabc = n / lcm(a, lcm(b, c));
    cout << na + nb + nc - nab - nbc - nca + nabc << endl;
    return 0;
}