import java.util.*;


public class Main {
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);

        int n = in.nextInt();
        int[] arr = new int[n + 1];

        for (int i = 1; i <= n; i++) {
            arr[i] = Integer.MIN_VALUE;
        }
        arr[0] = 0;

        int a = in.nextInt();
        int b = in.nextInt();
        int c = in.nextInt();

        for (int i = Math.min(a, Math.min(b, c)); i <= n; i++) {

            if (i >= a) arr[i] = Math.max(arr[i], arr[i-a]+1);
            if (i >= b) arr[i] = Math.max(arr[i], arr[i-b]+1);
            if (i >= c) arr[i] = Math.max(arr[i], arr[i-c]+1);
        }
        System.out.println(arr[n]);
    }
}