#include <bits/stdc++.h>

using namespace std;

long lcm(long a, long b) {
    return (a * b) / __gcd(a, b);
}

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

    long 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;
}