#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <string.h>
#include <vector>
using namespace std;

#define ll long long
#define INF (1 << 30)
#define INFLL (1LL << 60)

#define FOR(i,a,b) for(ll i = (a);i<(b);i++)
#define REP(i,a) FOR(i,0,(a))
#define MP make_pair

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

ll lcm(ll a, ll b){
	return a * b / gcd(a, b);
}

int main() {
	ll n, a, b, c;
	cin >> n >> a >> b >> c;
	ll ans = 0;
	ans += n / a;
	ans += (n / b) - (n / lcm(a, b));
	ans += (n / c) - ((n / lcm(a, c)) + (n / lcm(b, c)) - (n / lcm(lcm(a, b), c)));
	cout << ans << endl;
	return 0;
}