#include <iostream>

int main()
{
    long N;
    int a,b,c;
    int tmp;
    int num = 0;
    std::cin >> N;
    std::cin >> a >> b >> c;
    if(a < b)
    {
        tmp = a;
        a = b;
        b = tmp;
    }
    int aa = a;
    int bb = b;
    int r = aa % bb;
    while(r != 0)
    {
        aa = bb;
        bb = r;
        r = aa % bb;
    }
    r = (a*b)/bb;
    
    num=(N / a) + ((N / b) - (N / b / a)) + ((N / c) - (N / a / c) - (N / b / c) + (N / r / c));
    std::cout << num << std::endl;
    
    return 0;
}