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.Scanner;
  
  public class Solution {
      public static void main(String[] args) {
          Scanner scn = new Scanner(System.in);
          int testCases = scn.nextInt();
          while(testCases!=0){
              int height = 1;
              int len = scn.nextInt();
              int [] days = new int[len];
              for(int i=0;i<days.length;i++){
                  days[i] = scn.nextInt();
              }
              for(int i=0;i<days.length;i++){
                  if(days[i]==1){
                      if((i>0 && days[i-1] == 0) || (i==0)){
                          height+=1;
                      }else{
                          height+=5;
                      }
                  }else{
                      if(i>0 && days[i-1]==0){
                          height = -1;
                          break;
                      }
  
                  }
              }
              System.out.println(height);
              testCases--;
          }
      }
  }
  
  