import java.util.Scanner;

public class N316 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n=sc.nextInt(),a=sc.nextInt(),b=sc.nextInt(),c=sc.nextInt();
		int cnt=0;
		for(int i=1;i<=n;i++){
			if(i%a==0||i%b==0||i%c==0){
				cnt++;
			}
		}
		System.out.println(cnt);
	}

}