N, M = map(int, input().split())
X, C, W = [], [0] * 6, 10 ** 5 + 10
A, B = [[] for _ in range(W)], [[] for _ in range(W)]
for R in range(N):
    u, a, b = map(int,input().split())
    X.append(u + 1)
    C[u + 1] += 1
    A[a].append(R)
    B[b].append(R)
SA, SB = 0, W
ANS = W
while True:
    if SA >= W:
        break
    if sum(C[2:]) >= M and sum(C[3:]) < ANS:
        ANS = sum(C[3:])
    for R in A[SA]:
        C[X[R]] -= 1
        X[R] -= 1
        C[X[R]] += 1
    SA += 1
    while SB > 0 and sum(C[2:]) < M:
        SB -= 1
        for T in B[SB]:
            C[X[T]] -= 1
            X[T] += 1
            C[X[T]] += 1
print(ANS)