Problem:
Score : 400 points

Problem Statement

Joisino is planning to record N TV programs with recorders.

The TV can receive C channels numbered 1 through C.

The i-th program that she wants to record will be broadcast from time s_i to time t_i (including time s_i but not t_i) on Channel c_i.

Here, there will never be more than one program that are broadcast on the same channel at the same time.

When the recorder is recording a channel from time S to time T (including time S but not T), it cannot record other channels from time S-0.5 to time T (including time S-0.5 but not T).

Find the minimum number of recorders required to record the channels so that all the N programs are completely recorded.

Constraints

1≤N≤10^5

1≤C≤30

1≤s_i<t_i≤10^5

1≤c_i≤C

If c_i=c_j and i≠j, either t_i≤s_j or s_i≥t_j.

All input values are integers.

Input

Input is given from Standard Input in the following format:

N C
s_1 t_1 c_1
:
s_N t_N c_N

Output

When the minimum required number of recorders is x, print the value of x.

Sample Input 1

3 2
1 7 2
7 8 1
8 12 1

Sample Output 1

2

Two recorders can record all the programs, for example, as follows:

With the first recorder, record Channel 2 from time 1 to time 7. The first program will be recorded. Note that this recorder will be unable to record other channels from time 0.5 to time 7.

With the second recorder, record Channel 1 from time 7 to time 12. The second and third programs will be recorded. Note that this recorder will be unable to record other channels from time 6.5 to time 12.

Sample Input 2

3 4
1 3 2
3 4 4
1 4 3

Sample Output 2

3

There may be a channel where there is no program to record.

Sample Input 3

9 4
56 60 4
33 37 2
89 90 3
32 43 1
67 68 3
49 51 3
31 32 3
70 71 1
11 12 3

Sample Output 3

2

Solution in Ruby (2.3.3) (judge verdict: Accepted)

#require 'pp'

n, c = gets.split.map(&:to_i)
sw = []
sw2 = []
memo = {}
t_max = 0

n.times do |i|
    s, t, c = gets.split.map(&:to_i)
    memo[c] ||= []
    memo[c] << [s, t]
end

memo.each do |ch, r|
    r.sort!

    while r.size >= 2
        x1 = r.shift
        x2 = r.shift
 
        if x1[1] == x2[0]
            r.unshift([x1[0], x2[1]])
        else
            r.unshift(x2)

            sw << x1[0]
            sw2 << x1[1]
    
            if x1[1] > t_max
                t_max = x1[1]
            end 
        end
    end
    x1 = r.shift
    sw << x1[0]
    sw2 << x1[1]

    if x1[1] > t_max
        t_max = x1[1]
    end 
end
#pp memo
sw.sort!
sw2.sort!

#pp sw
#pp sw2
#pp t_max

counter = Array.new(t_max + 1, 0)
counter2 = Array.new(t_max + 1, 0)
sw.each do |s|
    counter[s - 1] += 1
end
sw2.each do |s|
    counter2[s] += 1
end
1.upto(counter.length - 1) do |i|
    counter[i] = counter[i - 1] + counter[i]
end
1.upto(counter2.length - 1) do |i|
    counter2[i] = counter2[i - 1] + counter2[i]
end

ans = 0
1.upto(counter.length - 1) do |i|
    d = counter[i] - counter2[i]
    if d > ans
        ans = d
    end
end

puts ans