#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

const int MAX_NUM    = 5;
const int DIFFICULTY = 100000;

int main()
{
    int n, m;
    cin >> n >> m;
    vector<int> x(n);
    vector<vector<int> > va(DIFFICULTY+2), vb(DIFFICULTY+2);
    for(int i=0; i<n; ++i){
        int a, b;
        cin >> x[i] >> a >> b;
        va[a].push_back(i);
        vb[b].push_back(i);

    }

    vector<int> cnt(MAX_NUM+1, 0);
    for(int i=0; i<n; ++i){
        ++ x[i];
        ++ cnt[x[i]];
    }
    for(int i=MAX_NUM; i>0; --i)
        cnt[i-1] += cnt[i];

    int a = 0;
    int ans = INT_MAX;
    for(int b=DIFFICULTY+1; b>=0; --b){
        for(int i : vb[b]){
            ++ x[i];
            ++ cnt[x[i]];
        }
        while(cnt[2] >= m){
            ans = min(ans, cnt[3]);
            if(a > DIFFICULTY)
                break;
            for(int i : va[a]){
                -- cnt[x[i]];
                -- x[i];
            }
            ++ a;
        }
    }
    cout << ans << endl;

    return 0;
}