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ZOJ Problem Set - 2316
Matrix Multiplication

Time Limit: 2 Seconds      Memory Limit: 32768 KB

Let us consider undirected graph G = which has N vertices and M edges. Incidence matrix of this graph is N * M matrix A = {aij}, such that aij is 1 if i-th vertex is one of the ends of j-th edge and 0 in the other case. Your task is to find the sum of all elements of the matrix ATA.

This problem contains multiple test cases!

The first line of a multiple input is an integer N, then a blank line followed by N input blocks. Each input block is in the format indicated in the problem description. There is a blank line between input blocks.

The output format consists of N output blocks. There is a blank line between output blocks.


The first line of the input file contains two integer numbers - N and M (2 <= N <= 10 000, 1 <= M <= 100 000). 2M integer numbers follow, forming M pairs, each pair describes one edge of the graph. All edges are different and there are no loops (i.e. edge ends are distinct).


Output the only number - the sum requested.

Sample Input


4 4
1 2
1 3
2 3
2 4

Sample Output


Author: Andrew Stankevich
Source: Andrew Stankevich's Contest #1
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