#include <bits/stdc++.h>
//#include "atcoder/all"
typedef long long int ll;
using namespace std;
// using namespace atcoder;
ll gcd(ll x, ll y) {
    if (y == 0) {
        return x;
    }
    else {
        return gcd(y, x % y);
    }
}
int main() {
    ll n, a, b, c;
    cin >> n >> a >> b >> c;
    ll ab = a * b / gcd(a, b);
    ll bc = b * c / gcd(b, c);
    ll ca = c * a / gcd(c, a);
    ll abc = a * bc / gcd(a, bc);
    cout << n / a + n / b + n / c - n / ab - n / bc - n / ca + n / abc << endl;
    return 0;
}