import java.util.Scanner;

public class Main {

	@SuppressWarnings("resource")
	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		int n=scanner.nextInt();
		int a=scanner.nextInt();
		int b=scanner.nextInt();
		int c=scanner.nextInt();
		long ab=n/(a*b);
		long ac=n/(a*c);
		long bc=n/(b*c);
		long abc=n/(a*b*c);
		long na=n/a;
		long nb=n/b;
		long nc=n/c;
		if(b%a==0){
			ab=0;
			bc=0;
			abc=0;
			nb=0;
		}
		if(c%a==0||c%b==0){
			ac=0;
			bc=0;
			abc=0;
			nc=0;
		}
		System.out.println(na+nb+nc-(ab+ac+bc-abc));
		
	}
}