import sys
input = sys.stdin.readline

N,M=map(int,input().split())

P=[list(map(int,input().split())) for i in range(N)]

ANS=[0]*N
TWO=0
THREE=0

LIST=[[] for i in range(10**5+2)]

for i in range(N):
    ANS[i]=P[i][0]

    LIST[P[i][1]].append(i)

for i in range(N):
    if ANS[i]>=2:
        TWO+=1
    if ANS[i]>=3:
        THREE+=1

LANS=10**6

for i in range(10**5+1,-1,-1):
    for x in LIST[i]:
        ANS[x]+=1

        if ANS[x]==3:
            THREE+=1
        elif ANS[x]==2:
            TWO+=1

    if TWO>=M:
        LANS=min(LANS,THREE)
        continue

    OK=0
    NG=10**5+1

    while NG>OK:
        mid=(OK+NG)//2

        TWOX=TWO
        THREEX=THREE

        for i in range(N):
            k=P[i][2]

            if k>=mid:
                if ANS[i]+1==2:
                    TWOX+=1
                elif ANS[i]+1==3:
                    THREEX+=1

            if TWOX>=M:
                OK=mid
            else:
                NG=mid


    TWOX=TWO
    THREEX=THREE

    for i in range(N):
        k=P[i][2]

        if k>=OK:
            if ANS[i]+1==2:
                TWOX+=1
            elif ANS[i]+1==3:
                THREEX+=1

    LANS=min(LANS,THREEX)
print(LANS)