#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <string>
#include <queue>
#include <stack>
#include <math.h>
#include <set>
#define ALL(obj) (obj).begin(),(obj).end()
#define RALL(obj) (obj).rbegin(),(obj).rend()
#define P pair<int, int>

#define MOD 1000000007
#define INF 1012345678
#define NINF (-2147483647-1)
#define LLINF 9223372036854775807
using ll = long long;
using namespace std;

//gcd(long long)
ll gcd(ll a, ll b) {
    return b ? gcd(b, a%b) : a;
}

int main() {
    ll N, a, b, c;
    ll ans = 0;
    cin >> N >> a >> b >> c;
    ans += N / a + N / b + N / c;
    ll d = a * b / gcd(a, b);
    ans -= N / d;
    ans -= N / (b * c / gcd(b, c));
    ans -= N / (c * a / gcd(c, a));
    ans += N / (d * c / gcd(d, c));
    cout << ans << endl;
    getchar(); getchar();
    return 0;
}