#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
Int lcm(Int a,Int b){return a/__gcd(a,b)*b;};
signed main(){
  Int n,a,b,c;
  cin>>n>>a>>b>>c;
  Int ans=0;
  for(Int i=0;i<2;i++){
    for(Int j=0;j<2;j++){
      for(Int k=0;k<2;k++){
	Int x=1;
	if(i) x=lcm(x,a);
	if(j) x=lcm(x,b);
	if(k) x=lcm(x,c);
	if((i+j+k)&1) ans-=n/x;
	else ans+=n/x;	
      }
    }
  }
  cout<<n-ans<<endl;
  return 0;
}