description: Petya has got an interesting flower. Petya is a busy person, so he sometimes forgets to water it. You are given n days from Petya's live and you have to determine what happened with his flower in the end.
  
  The flower grows as follows: 
  
    * If the flower isn't watered for two days in a row, it dies. 
    * If the flower is watered in the i-th day, it grows by 1 centimeter. 
    * If the flower is watered in the i-th and in the (i-1)-th day (i > 1), then it grows by 5 centimeters instead of 1. 
    * If the flower is not watered in the i-th day, it does not grow. 
  
  
  
  At the beginning of the 1-st day the flower is 1 centimeter tall. What is its height after n days?
  
  Input
  
  Each test contains multiple test cases. The first line contains the number of test cases t (1 ≤ t ≤ 100). Description of the test cases follows.
  
  The first line of each test case contains the only integer n (1 ≤ n ≤ 100).
  
  The second line of each test case contains n integers a_1, a_2, ..., a_n (a_i = 0 or a_i = 1). If a_i = 1, the flower is watered in the i-th day, otherwise it is not watered.
  
  Output
  
  For each test case print a single integer k — the flower's height after n days, or -1, if the flower dies.
  
  Example
  
  Input
  
  
  4
  3
  1 0 1
  3
  0 1 1
  4
  1 0 0 1
  1
  0
  
  
  Output
  
  
  3
  7
  -1
  1
solution: import java.util.*;
  import java.io.*;
  
  public class A {
  	public static void main(String[] args) {
  		Scanner sc = new Scanner(System.in);
  		PrintWriter out = new PrintWriter(System.out);
  
  		int t = sc.nextInt();
  		for (; t > 0; t--) {
  			int n = sc.nextInt();
  			var a = new int[n];
  
  			for (int i = 0; i < n; i++)
  				a[i] = sc.nextInt();
  
  			int size = 1;
  			if (a[0] == 1)
  				size++;
  
  			for (int i = 1; i < n; i++) {
  				if (a[i] == 1) {
  					if (a[i-1] == 1)
  						size += 5;
  					else
  						size++;
  				} else {
  					if (a[i-1] == 0) {
  						size = -1;
  						break;
  					}
  				}
  			}
  
  			out.println(size);
  		}
  
  		out.close();
  		sc.close();
  	}
  }
  