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