import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		int count = 0;
		for(int i=1; i<=N; i++) {
			if(i % a == 0) {
				count++;
			} else if(i % b == 0) {
				count++;
			} else if(i % c == 0) {
				count++;
			}	
		}
		System.out.println(count);
	}
}