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/lcm(a,b);
		long ac=n/lcm(a,c);
		long bc=n/lcm(b,c);
		long abc=n/lcm(a,lcm(b,c));
		long na=n/a;
		long nb=n/b;
		long nc=n/c;
		System.out.println(na+nb+nc-(ab+ac+bc-abc));
		
	}
	
	/*******************************************************************
	最大公約数
	*******************************************************************/
		static long gcd(long a, long b) {
			long temp;
			while ((temp = a % b) != 0) {
				a = b;
				b = temp;
			}
			return b;
		}

	/*******************************************************************
	最小公倍数
	*******************************************************************/
		static long lcm(long m, long n) {
			return m / gcd(m, n) * n;
		}
}