#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll inf=14449999999994;
ll mod=998244353 ;
ll gcd(ll a, ll b) {
	a = abs(a); b = abs(b);
	if (a < b)swap(a, b);
	while (b) {
	    ll r=a%b;
        a=b;
	    b=r;
	}
	return a;
}
int main(){
    ll n;
    cin >> n;
    ll a,b,c;
    cin >> a >> b >> c;
    ll ans=n/a+n/b+n/c;
    ll x=a*b/gcd(a,b);
    ll y=a*c/gcd(a,c);
    ll z=b*c/gcd(b,c);
    ans-=n/x+n/y+n/z;
    x=x*c/gcd(x,c);
    ans+=n/x;
    cout << ans << endl;
}