#include <iostream>

int main()
{
    int n, a, b, c;
    int count = 0;

    std::cin >> n;
    std::cin >> a >> b >> c;
    
    count += n / a;
    count += n / b;
    count += n / c;
    
    count -= n / (a * b);
    count -= n / (b * c);
    count -= n / (c * a);
    count -= n / (a * b * c);
    
    std::cout << count << std::endl;
    
    return 0;
}