Problem
Given a square matrix, compute the sum of all elements above the main diagonal.
Input format
Input
input.txt
- An integer N (1 ≤ N ≤ 50) - N rows, each with N integers
Output format
Output
output.txt
- The sum.
Example
input
3 1 2 3 4 5 6 7 8 9
output
11
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Sample cases (from the problem)
Sample Case 1
Input
3 1 2 3 4 5 6 7 8 9
Expected output
11
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