#include <iostream>
using namespace std;

long long gcd(long long a, long long b) {
    return b == 0 ? a : gcd(b, a % b);
}

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

int main() {
    long long N, a, b, c;
    cin >> N >> a >> b >> c;

    long long count_multiples = 
        (N / a) + (N / b) + (N / c) 
        - (N / lcm(a, b)) - (N / lcm(a, c)) - (N / lcm(b, c)) 
        + (N / lcm(a, lcm(b, c)));

    cout << count_multiples << endl;
    return 0;
}