//https://ncode.syosetu.com/n4830bu/316/
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

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