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Given an array A[ ] denoting the time taken to complete N tasks, determine the minimum amount of time required to finish the tasks considering that you can skip any task, but skipping two consecutive tasks is forbidden.

Example 1:

N = 2
A[] ={10,20}
Output: 10
Explanation: we can take time of
10 units and skip 20 units time.

​Example 2:

N = 4
A[] = {10,5,7,10}
Output: 12
Explanation: we can skip both the
tens and pick 5 and 7 only.


Your Task:
You don't need to read input or print anything. Your task is to complete the function minAmount() which accepts array A[] and its size N as input parameter and returns 
minimum amount of time required to finish the tasks.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(1)

1 <= N <= 106


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