import java.util.Scanner;

public class N316 {
	static long n,a,b,c;
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		n=sc.nextInt();a=sc.nextInt();b=sc.nextInt();c=sc.nextInt();
		long ab=koubai(a,b,a,b);
		long bc=koubai(b,c,b,c);
		long ca=koubai(c,a,c,a);
		long abc=koubai(ab,bc,ab,bc);
			System.out.println(n/a+n/b+n/c-n/ab-n/bc-n/ca+n/abc);
	}

	static long koubai(long a,long b,long aa,long bb){
		return a*b/gcd(a,b);
	}
	static long gcd(long a,long b){
		if(a%b==0){
			return b;
		}else{
			return gcd(b,a%b);
		}
	}
}