N,M=map(int,input().split())
W=10**5+10
C=[0,0,0,0,0,0]
A=[[] for i in range(W)]
B=[[] for i in range(W)]
Student=[]

for i in range(N):
    x,a,b=map(int,input().split())
    Student.append(x+1)
    A[a].append(i)
    B[b].append(i)
    C[x+1]+=1
#print(C)   
SA=0
SB=W
ans=W
while True:
    if SA>=W:
        break
    #print(SA,SB,C)
    if sum(C[2:])>=M and sum(C[3:])<ans:
        ans=sum(C[3:])
    
    for ids in A[SA]:
        C[Student[ids]]-=1
        Student[ids]-=1
        C[Student[ids]]+=1
    SA+=1
    
    while SB>0 and sum(C[2:])<M:
        #print(C,sum(C[2:]),M)
        SB-=1
        for ids in B[SB]:
            C[Student[ids]]-=1
            Student[ids]+=1
            C[Student[ids]]+=1
print(ans)