December 23, 2018

# The average main diagonal

Square matrix is a matrix of rows and columns of equal. Matrix NxN square matrix called ranks N. AII elements constitute the main diagonal of a square matrix. (Diagonal from left to right, up to down).

**Threads:** Enter into a square matrix of degree n. Calculate the average of the main diagonal.

**Input:** The first line contains the number n. The next n lines each containing n integers separated by spaces.

**Output:** A unique number is an average to be calculated. Results rounded to 2 decimal.

**For example:**

input: 2 3 5 1 7 output: 5.00

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