#include <iostream>

int main()
{
    long N;
    int a,b,c;
    int num = 0;
    std::cin >> N;
    std::cin >> a >> b >> c;
    for(int i = 1;i <= N;i++)
    {
        if(i % a == 0 || i % b == 0 || i % c == 0)
        {
            num++;
        }
    }
    std::cout << num << std::endl;
    
    return 0;
}