#include "bits/stdc++.h"
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*b/gcd(a,b);
}


int main() {
	ll N, a, b, c;
	cin >> N >> a >> b >> c;
	ll n[7];
	n[0] = N/a; n[1]=N/b; n[2]=N/c;
	n[3] = N/lcm(a,b);
	n[4] = N/lcm(b,c);
	n[5] = N/lcm(a,c);
	n[6] = N/lcm(a,lcm(b,c));

	cout << n[0]+n[1]+n[2]-(n[3]+n[4]+n[5])+n[6] << endl;
}