Polycarp has n friends, the i-th of his friends has a_i candies. Polycarp's friends do not like when they have different numbers of candies. In other words they want all a_i to be the same. To solve this, Polycarp performs the following set of actions exactly once: 

  * Polycarp chooses k (0 ≤ k ≤ n) arbitrary friends (let's say he chooses friends with indices i_1, i_2, …, i_k); 
  * Polycarp distributes their a_{i_1} + a_{i_2} + … + a_{i_k} candies among all n friends. During distribution for each of a_{i_1} + a_{i_2} + … + a_{i_k} candies he chooses new owner. That can be any of n friends. Note, that any candy can be given to the person, who has owned that candy before the distribution process. 



Note that the number k is not fixed in advance and can be arbitrary. Your task is to find the minimum value of k.

For example, if n=4 and a=[4, 5, 2, 5], then Polycarp could make the following distribution of the candies: 

  * Polycarp chooses k=2 friends with indices i=[2, 4] and distributes a_2 + a_4 = 10 candies to make a=[4, 4, 4, 4] (two candies go to person 3). 



Note that in this example Polycarp cannot choose k=1 friend so that he can redistribute candies so that in the end all a_i are equal.

For the data n and a, determine the minimum value k. With this value k, Polycarp should be able to select k friends and redistribute their candies so that everyone will end up with the same number of candies.

Input

The first line contains one integer t (1 ≤ t ≤ 10^4). Then t test cases follow.

The first line of each test case contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5).

The second line contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 10^4).

It is guaranteed that the sum of n over all test cases does not exceed 2 ⋅ 10^5.

Output

For each test case output: 

  * the minimum value of k, such that Polycarp can choose exactly k friends so that he can redistribute the candies in the desired way; 
  * "-1" if no such value k exists. 

Example

Input


5
4
4 5 2 5
2
0 4
5
10 8 5 1 4
1
10000
7
1 1 1 1 1 1 1


Output


2
1
-1
0
0

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

public class B {

//		            ***                          ++                      
//	             +=-==+                      +++=-                     
//	            +-:---==+                   *+=----=                   
//	           +-:------==+               ++=------==                  
//	           =-----------=++=========================                
//	          +--:::::---:-----============-=======+++====             
//	          +---:..:----::-===============-======+++++++++           
//	          =---:...---:-===================---===++++++++++         
//	          +----:...:-=======================--==+++++++++++        
//	          +-:------====================++===---==++++===+++++      
//	         +=-----======================+++++==---==+==-::=++**+     
//	        +=-----================---=======++=========::.:-+*****    
//	       +==::-====================--:  --:-====++=+===:..-=+*****   
//	       +=---=====================-...  :=..:-=+++++++++===++*****  
//	       +=---=====+=++++++++++++++++=-:::::-====+++++++++++++*****+ 
//	      +=======++++++++++++=+++++++============++++++=======+****** 
//	      +=====+++++++++++++++++++++++++==++++==++++++=:...  . .+**** 
//	     ++====++++++++++++++++++++++++++++++++++++++++-.     ..-+**** 
//	     +======++++++++++++++++++++++++++++++++===+====:.    ..:=++++ 
//	     +===--=====+++++++++++++++++++++++++++=========-::....::-=++* 
//	     ====--==========+++++++==+++===++++===========--:::....:=++*  
//	     ====---===++++=====++++++==+++=======-::--===-:.  ....:-+++   
//	     ==--=--====++++++++==+++++++++++======--::::...::::::-=+++    
//	     ===----===++++++++++++++++++++============--=-==----==+++     
//	     =--------====++++++++++++++++=====================+++++++     
//	     =---------=======++++++++====+++=================++++++++     
//	     -----------========+++++++++++++++=================+++++++    
//	     =----------==========++++++++++=====================++++++++  
//	     =====------==============+++++++===================+++==+++++ 
//	     =======------==========================================++++++

	// created by : Nitesh Gupta

	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t = Integer.parseInt(br.readLine());
		StringBuilder sb = new StringBuilder();
		while (t-- > 0) {
			String[] scn = (br.readLine()).trim().split(" ");
			int n = Integer.parseInt(scn[0]);
			long[] arr = new long[n];
			scn = (br.readLine()).trim().split(" ");
			long sum = 0;
			for (int i = 0; i < n; i++) {
				arr[i] = Long.parseLong(scn[i]);
				sum += arr[i];
			}
			sort(arr);
			long k = 0;

			if (sum % n != 0) {
				k = -1;
			} else {
				long each = sum / n;
				for (int i = 0; i < n; i++) {
					if (arr[i] > each) {
						k += 1;
					}
				}
			}

			sb.append(k +"\n");
		}
		System.out.println(sb);
		return;

	}

	public static void sort(long[] arr) {
		int n = arr.length;
		for (int i = 0; i < n; i++) {
			int idx = (int) Math.random() * n;
			long temp = arr[i];
			arr[i] = arr[idx];
			arr[idx] = temp;
		}
		Arrays.sort(arr);
	}

	public static void sort(int[] arr) {
		int n = arr.length;
		for (int i = 0; i < n; i++) {
			int idx = (int) Math.random() * n;
			int temp = arr[i];
			arr[i] = arr[idx];
			arr[idx] = temp;
		}
		Arrays.sort(arr);
	}

	public static void print(long[][] dp) {
		for (long[] a : dp) {
			for (long ele : a) {
				System.out.print(ele + " ");
			}
			System.out.println();
		}
	}

	public static void print(int[][] dp) {
		for (int[] a : dp) {
			for (int ele : a) {
				System.out.print(ele + " ");
			}
			System.out.println();
		}
	}

	public static void print(int[] dp) {
		for (int ele : dp) {
			System.out.print(ele + " ");
		}
		System.out.println();
	}

	public static void print(long[] dp) {
		for (long ele : dp) {
			System.out.print(ele + " ");
		}
		System.out.println();
	}

}
