import java.util.Scanner;

class Main{
	static long gcd(long a,long b){
		if(a%b==0) return b;
		return gcd(b,a%b);
	}
	static long lcm(long a,long b){
		return a/gcd(a,b)*b;
	}
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			long n=sc.nextLong();
			long a=sc.nextLong(),b=sc.nextLong(),c=sc.nextLong();
			long ans=n/a+n/b+n/c-n/lcm(a,b)-n/lcm(b,c)-n/lcm(a,c)+n/lcm(a,lcm(b,c));
			System.out.println(ans);
		}
	}
}