#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
#define _overload3(_1,_2,_3,name,...) name
#define _rep(i,n) repi(i,0,n)
#define repi(i,a,b) for(int i=int(a);i<int(b);++i)
#define rep(...) _overload3(__VA_ARGS__,repi,_rep,)(__VA_ARGS__)
#define all(x) x.begin(),x.end() 
#define SZ(x) ((int)(x).size())
#define PB push_back
#define MP make_pair
#define V vector
#define P pair<int,int>
#define F first
#define S second
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
using ll = long long;
using ld = long double;
using namespace std;
const int INF =1001001001;
const int INFL =1<<30;
const int MAX = 2e6+1;


int main() {
    int n,m;cin>>n>>m;
    V<P> a(n),b(n);
    V<int> x(n);
    rep(i,n){
        int x1,a1,b1;
        cin>>x1>>a1>>b1;
        x[i]=x1+1;
        a[i]=MP(a1,i);
        b[i]=MP(b1,i);
    }
    sort(all(a));
    sort(all(b));
    int anow=0,bnow=n-1;
    int kan2=0,kan3=0;
    rep(i,n){
        if(x[i]>=2)kan2++;
        if(x[i]>=3)kan3++;
    }
    int ans=INF;
    rep(sa,100002){
        while(anow<n&&a[anow].first<sa){
            x[a[anow].second]--;
            if(x[a[anow].second]==1)kan2--;
            if(x[a[anow].second]==2)kan3--;
            anow++;
        }
        while(bnow>=0&&kan2<m){
            int t=b[bnow].first;
            while(b[bnow].first==t){
                x[b[bnow].second]++;
                if(x[b[bnow].second]==2)kan2++;
                if(x[b[bnow].second]==3)kan3++;
                bnow--;
            }
        }
        if(kan2>=m)chmin(ans,kan3);
    }
    cout<<ans<<endl;
    return 0;
}