#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll lcm(ll n, ll m){
  return n*m/gcd(n, m);
}

int main(){
  ll n; cin >> n;
  ll a, b, c; cin >> a >> b >> c;
  ll ab = lcm(a, b);
  ll bc = lcm(b, c);
  ll ca = lcm(c, a);
  ll abc = lcm(a, lcm(b,c));
  ll ans = n/a+n/b+n/c-(n/ab+n/bc+n/ca)+n/abc;
  cout << ans << endl;
  return 0;
}