#include <iostream>
using namespace std;
using ll = long long;

long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a;}
long long lcm(long long a, long long b) { return a / gcd(a, b) * b;}

int main() {
    ll n, a, b, c;
    cin >> n >> a >> b >> c;
    ll x = n / a + n / b + n / c;
    ll y = n / lcm(a, b) + n / lcm(b, c) + n / lcm(c, a);
    ll z = n / lcm(a, lcm(b, c));
    cout << x - y + z << endl;
    return 0;
}