import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextInt();
        long a = sc.nextInt();
        long b = sc.nextInt();
        long c = sc.nextInt();
        long ablcm = a*b/gcd(a,b);
        long bclcm = b*c/gcd(b,c);
        long calcm = c*a/gcd(c,a);
        long ALLlcm = ablcm*c/gcd(ablcm,c);
        
        long num=N/a+N/b+N/c-N/ablcm-N/bclcm-N/calcm+N/ALLlcm;
        System.out.println(num);
    }
    static long gcd(long x, long y){
        while(true){
            long t=x%y;
            x=y;
            y=t;
            if(t==0){break;}
        }
        return x;
    }
}