Mobile coding works. A laptop is faster for long sessions.

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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