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

#define int long long
#define rep(i,l,r) for(int i=(int)(l);i<(int)(r);i++)
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)x.size())
template<class T>bool chmax(T &a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T>bool chmin(T &a,T b){if(a>b){a=b;return 1;}return 0;}

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

const int inf = 1LL<<60;
const int mod = 1e9 + 7;
const double eps = 1e-9;

/*{
  }*/

int gcd(int a, int b){
  if(b == 0) return a;
  return gcd(b, a%b);
}

signed main(){
  int n, a, b, c;
  cin >> n >> a >> b >> c;

  int na = n/a;
  int nb = n/b;
  int nc = n/c;
  int nab = n/(a*b/gcd(a, b));
  int nbc = n/(b*c/gcd(b, c));
  int nca = n/(c*a/gcd(c, a));
  int t = a*b/gcd(a, b);
  int nabc = n /(t*c/gcd(t, c));

  int ans = na+nb+nc-nab-nbc-nca+nabc;
  cout << ans << endl;

  return 0;
}