#include <bits/stdc++.h>
#include<iostream>
#include<iomanip>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<list>
#include<queue>
#include<math.h>
#include<bitset>
using ll = long long;
using namespace std;

int main()
{
    ll n, a, b, c, ab, bc, ca, abc;
    cin >> n >> a >> b >> c;
    ab = n/(a*b/gcd(a, b));
    bc = n/(b*c/gcd(b, c));
    ca = n/(c*a/gcd(c, a));
    abc = n/(a*b/gcd(a, b)*c/gcd(a*b/gcd(a, b), c));
    cout << n/a + n/b + n/c - ab - bc - ca + abc << endl;
}