Description

You are given three n × n matrices A, B and C. Does the equation A × B = C hold true?

Input

The first line of input contains a positive integer n (n ≤ 500) followed by the the three matrices A, B and C respectively. Each matrix's description is a block of n × n integers.

It guarantees that the elements of A and B are less than 100 in absolute value and elements of C are less than 10,000,000 in absolute value.

Output

Output "YES" if the equation holds true, otherwise "NO".

2
1 0
2 3
5 1
0 8
5 1
10 26

YES

Hint

Multiple inputs will be tested. So O(n³) algorithm will get TLE.

Source

POJ Monthly--2007.08.05, qzc