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

int main(){
    ll n, a, b, c, ab, bc, ca, abc, A, B, C, AB, BC, CA, ABC;
    cin >> n >> a >> b >> c;
    ab = a * b / __gcd(a, b);
    bc = b * c / __gcd(b, c);
    ca = c * a / __gcd(c, a);
    abc = ab * c / __gcd(ab, c);
    A = n / a, B = n / b, C = n / c, AB = n / ab, BC = n / bc, CA = n / ca, ABC = n / abc;
    cout << A + B + C - AB - BC - CA + ABC << '\n';
}