#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll gcd(ll a,ll b){
	if(a<b)	swap(a,b);
	while(a%b!=0){
		ll tmp=b;
		b=a%b;
		a=tmp;
	}
	return b;
}
ll lcd(ll a,ll b){
	return a*b/gcd(a,b);
}
int main(){
	ll n,a,b,c;	cin>>n>>a>>b>>c;
	ll p=n/a+n/b+n/c+n/lcd(c,lcd(a,b));
	ll m=n/lcd(a,b)+n/lcd(b,c)+n/lcd(c,a);
	cout<<p-m<<endl;
	return 0;
}