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.io.*;
  import java.util.*;
  
  public class A {
  	public static void main(String args[]) throws IOException {
          PrintWriter out = new PrintWriter(new BufferedOutputStream(System.out));
  		int t = nextInt();
          while (t-->0) {
              int n = nextInt(), height = 1;
              int prev = nextInt(); height += prev;
              for (int i = 1; i < n; i++) {
                  int day = nextInt();
                  if (height == -1) {continue;}
  
                  if (prev == 0 && day == 0) {height = -1; continue;}
                  else if (day == 1) {
                      height += (prev == 1) ? 5 : 1;
                  }
                  prev = day;
              }
              out.println(height);
          }
          out.close();
  	}
  
  	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  	static StringTokenizer st = new StringTokenizer("");
  	static String next() throws IOException {
  		while (!st.hasMoreElements()) {st = new StringTokenizer(br.readLine());}
  		return st.nextToken();
  	}
  	static int nextInt() throws IOException {return Integer.parseInt(next());}
  	static long nextLong() throws IOException {return Long.parseLong(next());}
  	static double nextDouble() throws IOException {return Double.parseDouble(next());}
      static String nextLine() {
          String str = "";
          try {str = br.readLine();}
          catch (IOException e) {e.printStackTrace();}
          return str;
      }
  }
  