#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

int gcd(int a, int b){return (b==0?a:gcd(b,a%b));}
int lcm(int a, int b){return a/gcd(a,b)*b;}

int main(){
  int N;
  cin >> N;
  vector<int> v(3);
  rep(i,3){
    cin >> v[i];
  }

  ll ret = 0;
  for(int S=1; S<(1<<3); S++){
    int num = 0;
    for(int s=S; s>0; s>>=1) num += s&1;
    ll lcm = 1;
    for(int i=0; i<v.size(); i++){
      if((S>>i)&1){
        lcm = lcm / gcd(lcm, v[i]) * v[i];
        if(lcm > N) break;
      }
    }
    if(num%2 == 0) ret -= N / lcm;
    else ret += N / lcm;
  }
  cout << ret << endl;
  
  return 0;
}