#include<bits/stdc++.h>
using namespace std;
#define inf 1000000000
#define INF 1000000000000000
#define ll long long
#define ull unsigned long long
#define M (int)(1e9+7)
#define P pair<int,int>
#define PLL pair<ll,ll>
#define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++)
#define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--)
#define rep(i,n) FOR(i,0,n)
#define rrep(i,n) RFOR(i,n,0)
#define all(a) a.begin(),a.end()
#define IN(a,n) rep(i,n){ cin>>a[i]; }
const int vx[4] = {0,1,0,-1};
const int vy[4] = {1,0,-1,0};
#define PI 3.14159265
#define F first
#define S second
#define PB push_back
#define EB emplace_back
#define int ll
void init(){
  cin.tie(0);
  ios::sync_with_stdio(false);
}


int n;
int a,b,c;

main(){
  cin>>n;
  cin>>a>>b>>c;

  int ans=n/a+n/b+n/c;
  int ab=a*b/__gcd(a,b);
  int bc=b*c/__gcd(b,c);
  int ca=c*a/__gcd(c,a);
  ans-=n/ab+n/bc+n/ca;
  int abc=ab*c/__gcd(ab,c);
  ans+=n/abc;
  //cout<<ab<<' '<<bc<<' '<<ca<<' '<<abc<<endl;

  cout<<ans<<endl;
}