import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) {
        Read in = new Read();
        int n = in.nextInt();
        int k = n / 2;
        int m = n - k;
        int[] b = in.readArray(k);
        int[] c = in.readArray(m);
        Map<Integer, int[]> c1 = new HashMap<>();
        Map<Integer, int[]> c2 = new HashMap<>();
        for (int i = 0; i < (1 << k); i++) {
            int now = 0;
            int cnt = 0;
            for (int j = 0; j < k; j++) {
                if (((i >> j) & 1) == 1) {
                    now += b[j];
                    cnt++;
                }
            }
            if (!c1.containsKey(now)) {
                c1.put(now, new int[2]);
            }
            if (cnt % 2 == 0) {
                c1.get(now)[0]++;
            } else
                c1.get(now)[1]++;
        }

        for (int i = 0; i < (1 << m); i++) {
            int now = 0;
            int cnt = 0;
            for (int j = 0; j < m; j++) {
                if (((i >> j) & 1) == 1) {
                    now += c[j];
                    cnt++;
                }
            }
            if (!c2.containsKey(now)) {
                c2.put(now, new int[2]);
            }
            if (cnt % 2 == 0) {
                c2.get(now)[0]++;
            } else
                c2.get(now)[1]++;
        }

        long res = 0;
        for (int x : c1.keySet()) {
            if (c2.containsKey(-x)) {
                res += (long) c1.get(x)[0] * c2.get(-x)[0];
                res += (long) c1.get(x)[1] * c2.get(-x)[1];
            }
        }
        System.out.println(res - 1);
    }
    static class Read {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer("");

        String next() {
            while (!st.hasMoreTokens()) try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        int[] readArray(int n) {
            int[] a = new int[n];
            for (int i = 0; i < n; i++) a[i] = nextInt();
            return a;
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        char nextChar() {
            return next().charAt(0);
        }
    }
}