#include<bits/stdc++.h>

#define REP(i,s,n) for(int i=s;i<n;++i)
#define rep(i,n) REP(i,0,n)

using namespace std;

typedef long long ll;
ll N,a,b,c;

int main() {
  cin >> N >> a >> b >> c;
  ll v1 = N / a;
  ll v2 = N / b;
  ll v3 = N / c;

  ll ab = a / __gcd(a,b) * b;
  ll ac = a / __gcd(a,c) * c;
  ll bc = b / __gcd(b,c) * c;
  ll v4 = N / ab;
  ll v5 = N / ac;
  ll v6 = N / bc;

  ll tmp = a / __gcd(a,b) * b;
  ll abc = tmp / __gcd(tmp,c) * c;
  ll v7 = N / abc;
  cout << v1 + v2 + v3 - v4 - v5 - v6 + v7 << endl;
  return 0;
}