#include<cstdio>
#include <iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

using namespace std;
typedef long long ll;
typedef pair<ll, ll> Pr;


ll n, a, b, c;

ll gcd(ll a, ll b) {
	while (b != 0) {
		a = a % b;
		swap(a, b);
	}
	return a;
}

ll lcm(ll x, ll y) {
	return x*y / gcd(x, y);
}

int main()
{
	cin >> n >> a >> b >> c;
	
	ll A = n / a;
	ll B = n / b;
	ll C = n / c;
	ll AB = n / lcm(a,b);
	ll BC = n / lcm(b,c);
	ll CA = n / lcm(c,a);
	ll ABC = n / lcm(lcm(a,b),c);
	ll ans = A + B + C - AB - BC - CA + ABC;
	printf("%lld\n",ans);
	return 0;
}