Problem:
Score : 400 points

Problem Statement

There are N persons called Person 1 through Person N.

You are given M facts that "Person A_i and Person B_i are friends." The same fact may be given multiple times.

If X and Y are friends, and Y and Z are friends, then X and Z are also friends. There is no friendship that cannot be derived from the M given facts.

Takahashi the evil wants to divide the N persons into some number of groups so that every person has no friend in his/her group.

At least how many groups does he need to make?

Constraints

2 \leq N \leq 2\times 10^5

0 \leq M \leq 2\times 10^5

1\leq A_i,B_i\leq N

A_i \neq B_i

Input

Input is given from Standard Input in the following format:

N M
A_1 B_1
\vdots
A_M B_M

Output

Print the answer.

Sample Input 1

5 3
1 2
3 4
5 1

Sample Output 1

3

Dividing them into three groups such as \{1,3\}, \{2,4\}, and \{5\} achieves the goal.

Sample Input 2

4 10
1 2
2 1
1 2
2 1
1 2
1 3
1 4
2 3
2 4
3 4

Sample Output 2

4

Sample Input 3

10 4
3 1
4 1
5 9
2 6

Sample Output 3

3

Solution in Ruby (2.7.1) (judge verdict: Accepted)

require 'set'

n, m = gets.chomp.split(' ').map(&:to_i)

v = (0...n).map { nil }
g = (0...n).map { Set.new }
m.times do
  a, b = gets.chomp.split(' ').map(&:to_i)
  a -= 1
  b -= 1
  g[a].add(b)
  g[b].add(a)
end

(0...n).each do |i|
  next if v[i]

  c = 1

  s = [i]
  v[i] = c
  while !(s.empty?)
    j = s.pop
    g[j].each do |k|
      next if v[k]
      s.push(k)
      c += 1
      v[k] = c
    end
  end
end

puts v.max