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Problem
You are given an array of integers. Use pointers to calculate and print the sum of elements at odd indices.
Input format
Input
input.txt
- First line: integer N (1 ≤ N ≤ 100) - Second line: N space-separated integers
Output format
Output
output.txt
- Integer: the sum of elements at odd indices
Example
input
6 1 2 3 4 5 6
output
12
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Sample cases (from the problem)
Sample Case 1
Input
6 1 2 3 4 5 6
Expected output
12
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