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();

		boolean flag[] = new boolean[N+1];
		int check[] = { a,b,c };
		for(int i=0; i<3; i++) {
			for(int j=check[i]; j<=N; j+=check[i]) {
				flag[j] = true;
			}
		}
		
		int count = 0;
		for(int i=1; i<=N; i++) {
			if(flag[i]) count++;
		}
		System.out.println(count);
	}
}