#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;
using P = pair<int, int>;
constexpr ld EPS = 1e-12;
constexpr int INF = numeric_limits<int>::max() / 2;
constexpr int MOD = 1e9 + 7;

// gcd(a, b)
template <typename T>
T gcd(T a, T b)
{
    if (b == 0)
        return a;
    return gcd(b, a % b);
}

template <typename T>
T lcm(T a, T b)
{
    return a / gcd(a, b) * b;
}
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    ll n, a, b, c;
    cin >> n >> a >> b >> c;
    ll l = lcm(lcm(a, b), c);
    ll res = n / a + n / b + n / c - n / (lcm(a, b)) - n / (lcm(b, c)) - n / (lcm(c, a)) + n / l;
    cout << res << endl;
}