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Problem
Given a matrix, compute the sum of the boundary elements (first/last row, first/last column).
Input format
Input
input.txt
- First line: Two integers R and C (2 ≤ R, C ≤ 100) - Next R lines: C integers each
Output format
Output
output.txt
- A single integer: boundary sum
Example
input
3 3 1 2 3 4 5 6 7 8 9
output
40
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Sample cases (from the problem)
Sample Case 1
Input
3 3 1 2 3 4 5 6 7 8 9
Expected output
40
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