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

#define itn long long
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define rrep(i,m) for(int i=(int)(m)-1;i>=0;--i)
#define debug(x) cout << #x << "=" << (x) << endl;

template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return true;}return false;}
template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return true;}return false;}
template<typename T> void fail(T v){cout << v << endl;exit(0);}
//template end

void solve(){
  int N;
  cin>>N;
  int a[3];
  rep(i,3)cin>>a[i];
  ll res=0;
  for(int i=1;i<8;i++){
    ll p=1;int c=0;
    rep(j,3)
      if(1&i>>j)
        {p*=a[j];c++;}
    res+=(c%2?1:-1)*(N/p);
  }
  cout<<res<<endl;
}

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  solve();
  return 0;
}