import java.util.Scanner;

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

	}

}