#include <iostream>

typedef long long dlong;

dlong gcd(dlong a, dlong b) {
    if (a < b) {
        dlong tmp = b;
        b = a;
        a = tmp;
    }

    while (true) {
        dlong mod = a % b;
        if (mod == 0) break;
        a = b;
        b = mod;
    }

    return b;
}

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

int main(int argc, char const* argv[]) {
    dlong n;
    std::cin >> n;

    dlong a, b, c;
    std::cin >> a >> b >> c;

    dlong gcd_ab  = lcm(a, b);
    dlong gcd_bc  = lcm(b, c);
    dlong gcd_ca  = lcm(c, a);
    dlong gcd_abc = lcm(gcd_ab, c);

    dlong ans = n /a + n / b + n / c - n /gcd_ab - n /gcd_bc - n / gcd_ca + n / gcd_abc;

    std::cout << ans << std::endl;
    return 0;
}