#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (llong i = 0; i < (llong)(n); i++)
#define llong long long

llong gcd(llong a, llong b) {
    if(a % b == 0) return b;
    return gcd(b, a % b);
}

llong lcm(llong a, llong b) {
    return a * b / gcd(max(a, b), min(a, b));
}

int main() {
    llong n, a, b, c;
    cin >> n;
    cin >> a >> b >> c;

    llong result = n / a + n / b + n / c
        - n / lcm(a, b) - n / lcm(b, c) - n / lcm(c, a)
        + n / lcm(lcm(a, b), c)
    ;
    cout << result << "\n";
}