import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();
		int a = sc.nextInt(), b = sc.nextInt(), c = sc.nextInt();
		
		int cnt = 0;
		
		for(int i = 1; i <= N; i++) {
			if(i % a == 0 || i % b == 0 || i % c == 0) {
				cnt++;
			}
		}
		
		System.out.println(cnt);
	}
}