#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N, M = map(int, readline().split())
m = map(int, read().split())
X, A, B = zip(*zip(m, m, m))
X = [x + 1 for x in X]
U = 10 ** 5 + 1

A_to_I = [[] for _ in range(U)]
B_to_I = [[] for _ in range(U)]
for i, a in enumerate(A):
    A_to_I[a].append(i)

for i, b in enumerate(B):
    B_to_I[b].append(i)

counts = [0, 0, 0, 0, 0, 0]
for x in X:
    counts[x] += 1

A = 0
B = 10 ** 5 + 1

answer = 10 ** 9
while True:
    if A >= U:
        break
    if sum(counts[2:]) >= M and sum(counts[3:]) < answer:
        answer = sum(counts[3:])
    for i in A_to_I[A]:
        counts[X[i]] -= 1
        X[i] -= 1
        counts[X[i]] += 1
    A += 1
    while B > 0 and sum(counts[2:]) < M:
        B -= 1
        for i in B_to_I[B]:
            counts[X[i]] -= 1
            X[i] += 1
            counts[X[i]] += 1

print(answer)