Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

B. Cactusophobia

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputTree is a connected undirected graph that has no cycles. Edge cactus is a connected undirected graph without loops and parallel edges, such that each edge belongs to at most one cycle.

Vasya has an edge cactus, each edge of this graph has some color.

Vasya would like to remove the minimal number of edges in such way that his cactus turned to a tree. Vasya wants to make it in such a way that there were edges of as many different colors in the resulting tree, as possible. Help him to find how many different colors can the resulting tree have.

Input

The first line contains two integers: *n*, *m* (2 ≤ *n* ≤ 10 000) — the number of vertices and the number of edges in Vasya's graph, respectively.

The following *m* lines contain three integers each: *u*, *v*, *c* (1 ≤ *u*, *v* ≤ *n*, *u* ≠ *v*, 1 ≤ *c* ≤ *m*) — the numbers of vertices connected by the corresponding edge, and its color. It is guaranteed that the described graph is indeed an edge cactus.

Output

Output one integer: the maximal number of different colors that the resulting tree can have.

Examples

Input

4 4

1 2 4

2 3 1

3 4 2

4 2 3

Output

3

Input

7 9

1 2 1

2 3 4

3 1 5

1 4 5

4 5 2

5 1 6

1 6 4

6 7 6

7 1 3

Output

6

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: May/24/2017 07:15:02 (c2).

Desktop version, switch to mobile version.
User lists

Name |
---|