#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;
typedef long long ll;

ll gcd(ll a,ll b){
	if(b==0)return a;
	return gcd(b,a%b);
}
ll lcm(ll a,ll b){
	return a/gcd(a,b)*b;
}
ll a[3];
int main(){
	int n;scanf("%d",&n);
	rep(i,3)scanf("%lld",&a[i]);
	ll ans=0;
	rep(i,1<<3){
		if(i==0)continue;
		ll cnt=0,l=1;
		rep(j,3){
			if(i>>j&1){
				cnt++;l=lcm(l,a[j]);
			}
		}
		if(cnt&1)ans+=n/l;
		else ans-=n/l;
	}
	cout<<ans<<endl;
}