#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)



typedef long long ll;
ll gcd(ll a, ll b) { return a ? gcd(b%a, a) : b; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
//-----------------------------------------------------------------------------------
int N, A, B, C;
ll cnt(ll x) { // xの倍数が[1,N]に何個あるか
    return N / x;
}
//-----------------------------------------------------------------------------------
int main() {
    cin >> N >> A >> B >> C;

    ll ans = cnt(A) + cnt(B) + cnt(C);
    ans -= cnt(lcm(A, B));
    ans -= cnt(lcm(B, C));
    ans -= cnt(lcm(A, C));
    ans += cnt(lcm(A, lcm(B, C)));
    cout << ans << endl;
}