AT_abc473_a [ABC473A] Second Half Sum

You are given an integer sequence of length $ N $ : $ A=(A_1,A_2,\dots,A_N) $ . Here, $ N $ is even. Find the sum of the latter half of $ A $ , that is, the sum of $ A_{(N/2)+1},A_{(N/2)+2},\dots,A_{N} $ .

The input is given from Standard Input in the following format: > $ N $ $ A_1 $ $ A_2 $ $ \dots $ $ A_N $

Output the answer.

### Sample Explanation 1 The length of the sequence $ A $ is $ N=8 $ , and you should find the sum of $ A_5,A_6,A_7,A_8 $ . Since $ A_5+A_6+A_7+A_8 = 4+2+5+6=17 $ , output $ 17 $ . ### Constraints - All input values are integers. - $ N $ is an even number satisfying $ 2 \le N \le 100 $ . - $ 1 \le A_i \le 100 $