Luntik came out for a morning stroll and found an array a of length n. He calculated the sum s of the elements of the array (s= ∑_{i=1}^{n} a_i). Luntik calls a subsequence of the array a nearly full if the sum of the numbers in that subsequence is equal to s-1.

Luntik really wants to know the number of nearly full subsequences of the array a. But he needs to come home so he asks you to solve that problem!

A sequence x is a subsequence of a sequence y if x can be obtained from y by deletion of several (possibly, zero or all) elements.

Input

The first line contains a single integer t (1 ≤ t ≤ 1000) — the number of test cases. The next 2 ⋅ t lines contain descriptions of test cases. The description of each test case consists of two lines.

The first line of each test case contains a single integer n (1 ≤ n ≤ 60) — the length of the array.

The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^9) — the elements of the array a.

Output

For each test case print the number of nearly full subsequences of the array.

Example

Input


5
5
1 2 3 4 5
2
1000 1000
2
1 0
5
3 0 2 1 1
5
2 1 0 3 0


Output


1
0
2
4
4

Note

In the first test case, s=1+2+3+4+5=15, only (2,3,4,5) is a nearly full subsequence among all subsequences, the sum in it is equal to 2+3+4+5=14=15-1.

In the second test case, there are no nearly full subsequences.

In the third test case, s=1+0=1, the nearly full subsequences are (0) and () (the sum of an empty subsequence is 0).
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.StringTokenizer;

public class Solve {

	static long MOD = 998244353L;
	static long INF = 1000_000_000_000_000L + 100;
	static boolean isPrime[];

	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner();
		PrintWriter pw = new PrintWriter(System.out);

		int t = sc.nextInt();
		while (t-- > 0) {
			int n = sc.nextInt();
			int a[] = sc.nextIntArray(n);
			long c0 = 0;
			long c1 = 0;
			for (int i : a) {
				if (i == 0)
					c0++;
				if (i == 1)
					c1++;
			}
			long ans = 0;
			if (c1 > 0)
				ans = c1;
			if (c0 > 0)
				ans = ans * c0 * 2;
			pw.println(ans);

		}
		pw.flush();

	}

	static int LowerBound(int a[], int x, int start) { // x is the target value or key
		int ans = -1;

		int l = start, r = a.length;
		while (l + 1 < r) {
			System.out.println("lolk");

			int m = (l + r) >>> 1;
			if (a[m] >= x) {
				ans = m;
				r = m;
			} else
				l = m;
		}
		return ans;
	}

	static int UpperBound(int a[], int x, int start) {// x is the key or target value
		int ans = -1;

		int l = start, r = a.length;
		while (l + 1 < r) {
			int m = (l + r) >>> 1;
			if (a[m] <= x) {
				ans = m;
				l = m;
			} else
				r = m;
		}
		return ans;
	}

	static public boolean[] sieve(int n) {
		boolean prime[] = new boolean[n + 1];
		for (int i = 0; i <= n; i++)
			prime[i] = true;

		for (int p = 2; p * p <= n; p++) {
			// If prime[p] is not changed, then it is a
			// prime
			if (prime[p] == true) {
				// Update all multiples of p
				for (int i = p * p; i <= n; i += p)
					prime[i] = false;
			}
		}
		return prime;

	}

	public static ArrayList<Integer> primeFactors(int n) {
		ArrayList<Integer> set = new ArrayList<Integer>();

		// Print the number of 2s that divide n
		while (n % 2 == 0) {
			n /= 2;
			set.add(2);
		}

		// n must be odd at this point. So we can
		// skip one element (Note i = i +2)
		for (int i = 3; i * i <= n; i += 2) {
			// While i divides n, print i and divide n
			while (n % i == 0) {
				n /= i;
				set.add(i);
			}
		}

		if (n > 1)
			set.add(n);

		return set;

	}

	static int gcd(int a, int b) {
		if (a == 0)
			return b;
		if (b == 0)
			return a;

		return gcd(b, a % b);

	}

	public static int[] swap(int data[], int left, int right) {

		// Swap the data
		int temp = data[left];
		data[left] = data[right];
		data[right] = temp;

		// Return the updated array
		return data;
	}

	public static long[] euclidExtended(long a, long b) {
		if (b == 0) {
			long ar[] = new long[] { 1, 0 };
			return ar;
		}
		long ar[] = euclidExtended(b, a % b);
		long temp = ar[0];
		ar[0] = ar[1];
		ar[1] = temp - (a / b) * ar[1];
		return ar;
	}

	public static long modInverse(long a, long m) {
		long ar[] = euclidExtended(a, m);
		return ((ar[0] % m) + m) % m;
	}

	// Fermat Theorem
	public static long ncr(int n, int r, long[] fact) {
		if (n == r)
			return 1;
		if (r == 1)
			return n;
		if (n == 0 || r == 0)
			return 1;
		return (fact[n] * modInverse(((long) fact[n - r]) * fact[r], MOD)) % MOD;
	}

	static void sort(int[] a) {
		ArrayList<Integer> l = new ArrayList<>();
		for (int i : a)
			l.add(i);
		Collections.sort(l);
		for (int i = 0; i < a.length; i++)
			a[i] = l.get(i);
	}

}

class Pair {
	int x, y;

	Pair(int x, int y) {
		this.x = x;
		this.y = y;
	}

}

class SegTree {
	int leftmost, rightmost, sum;
	SegTree lChild, rChild;

	public SegTree(int leftmost, int rightmost) {
		this.leftmost = leftmost;
		this.rightmost = rightmost;
	}

	public void update(int index, int val) {
		sum++;
		if (leftmost == rightmost) {
			return;
		}
		if (lChild == null)
			makeKids();
		if (index <= lChild.rightmost)
			lChild.update(index, val);
		else
			rChild.update(index, val);
	}

	public void makeKids() {
		int mid = (leftmost + rightmost) / 2;
		lChild = new SegTree(leftmost, mid);
		rChild = new SegTree(mid + 1, rightmost);
	}

	public int query(int l, int r) {
		if (l <= leftmost && r >= rightmost)
			return sum;
		if (l > rightmost || r < leftmost)
			return 0;
		if (lChild == null)
			return 0;
		return lChild.query(l, r) + rChild.query(l, r);
	}
}

class UnionFind {
	int[] p, rank, setSize;
	int numSets;

	public UnionFind(int N) {
		p = new int[numSets = N];
		rank = new int[N];
		setSize = new int[N];
		for (int i = 0; i < N; i++) {
			p[i] = i;
			setSize[i] = 1;
		}
	}

	public int findSet(int i) {
		return p[i] == i ? i : (p[i] = findSet(p[i]));
	}

	public boolean isSameSet(int i, int j) {
		return findSet(i) == findSet(j);
	}

	public void unionSet(int i, int j) {
		if (isSameSet(i, j))
			return;
		numSets--;
		int x = findSet(i), y = findSet(j);
		if (rank[x] > rank[y]) {
			p[y] = x;
			setSize[x] += setSize[y];
		} else {
			p[x] = y;
			setSize[y] += setSize[x];
			if (rank[x] == rank[y])
				rank[y]++;
		}
	}

	public int numDisjointSets() {
		return numSets;
	}

	public int sizeOfSet(int i) {
		return setSize[findSet(i)];
	}
}

class Scanner {
	BufferedReader br;
	StringTokenizer st;

	Scanner() {
		br = new BufferedReader(new InputStreamReader(System.in));
	}

	String next() throws IOException {
		while (st == null || !st.hasMoreElements())
			st = new StringTokenizer(br.readLine());
		return st.nextToken();
	}

	int nextInt() throws NumberFormatException, IOException {
		return Integer.parseInt(next());
	}

	int[] nextIntArray(int n) throws NumberFormatException, IOException {
		int a[] = new int[n];
		for (int i = 0; i < n; i++)
			a[i] = Integer.parseInt(next());
		return a;
	}

	long nextLong() throws NumberFormatException, IOException {
		return Long.parseLong(next());
	}

	long[] nextLongArray(int n) throws NumberFormatException, IOException {
		long a[] = new long[n];
		for (int i = 0; i < n; i++)
			a[i] = Long.parseLong(next());
		return a;
	}

	double nextDouble() throws NumberFormatException, IOException {
		return Double.parseDouble(next());
	}
}