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

N, B = map(int, readline().split())
m = map(int, read().split())
X, Y, P = zip(*zip(m, m, m))


def compress(A):
    x_to_i = {x: i for i, x in enumerate(sorted(set(A)))}
    return tuple(x_to_i[x] for x in A)


X = compress(X)
Y = compress(Y)
H = max(X)
W = max(Y)
best_N = 0
for i, j in itertools.combinations(range(W + 2), 2):
    Ns = [0] * (H + 2)
    Ps = [0] * (H + 2)
    INF = B + 10
    Ps[-1] = INF
    for x, y, p in zip(X, Y, P):
        if i <= y < j:
            Ns[x] += 1
            Ps[x] += p
    R = 0
    S = 0
    N = 0
    for L in range(H + 1):
        while R < L or S + Ps[R] <= B:
            N += Ns[R]
            S += Ps[R]
            R += 1
        if best_N < N:
            best_N = N
        S -= Ps[L]
        N -= Ns[L]

print(best_N)