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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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