#include<bits/stdc++.h>
using namespace std;
//#pragma GCC optimize("Ofast")

#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define vtpl(x,y,z) vector<tuple<x,y,z>>
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[9]={1,0,-1,0,1,1,-1,-1,0};
const ll dx[9]={0,1,0,-1,1,-1,1,-1,0};
template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
int main(){
  ll n,m;cin >> n >> m;
  vl x(n),a(n),b(n);
  rep(i,n)cin >> x[i] >> a[i] >> b[i];
  ll base=100001;
  vvl ia(base+1),ib(base+1);
  vl tp(6);
  rep(i,n){
    ia[a[i]].emplace_back(i);
    ib[b[i]].emplace_back(i);
    tp[x[i]+1]++;
  }
  ll right=base;
  ll ans=INF;
  for(ll left=0;left<=base;left++){
    while(right>=0){
      for(auto p:ib[right]){
        ll f=x[p]+(a[p]>=left? 1:0);
        tp[f]--;tp[f+1]++;
      }
      right--;
      if(tp[2]+tp[3]+tp[4]+tp[5]<m){
        //right--;
        continue;
      }
      /*for(auto p:ib[right]){
        ll f=x[p]+(a[p]>=left? 1:0)+1;
        tp[f]++;tp[f-1]--;
      }*/
      break;
    }
    //if(left<=20)cout << left <<" " << right << endl;
    if(tp[2]+tp[3]+tp[4]+tp[5]>=m)chmin(ans,tp[3]+tp[4]+tp[5]);
    for(auto p:ia[left]){
      ll f=x[p]+1+(b[p]>=right? 1:0);
      tp[f]--;tp[f-1]++;
    }
  }
  cout << ans << endl;

}