#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<ll>>;
ll gcd(ll(a), ll(b)) {
	ll c = a;
	while (a % b != 0) {
		c = a % b;
		a = b;
		b = c;
	}
	return b;
}
int main() {

    ll N,A,B,C;
    cin>>N>>A>>B>>C;
    ll AB=A*B/gcd(A,B);
    ll BC=B*C/gcd(B,C);
    ll CA=C*A/gcd(C,A);
    ll ABC=AB*C/gcd(AB,C);
    cout<<N/A+N/B+N/C-N/AB-N/BC-N/CA+N/ABC<<endl;

}