#include<cstdio>
#include<vector>
#include<cstring>
#include<algorithm>
#define ll long long
using namespace std;
ll ans,c[200101],n,x,L,R,cc;
vector<pair<ll,ll> >l[200101],r[200101];
int main(){
scanf(“%lld%lld”,&n,&x);
for(int i=1;i<=n;i++){
scanf(“%lld%lld%lld”,&L,&R,&cc);
l[L].push_back(make_pair(R-L+1,cc));
r[R].push_back(make_pair(R-L+1,cc));
}
memset(c,0x3f3f,sizeof(c));ans=c[0];
for(int i=1;i<200100;i++){
for(int j=0;j<l[i].size();j++)l[i][j].first>=x?0:ans=min(ans,c[x-l[i][j].first]+l[i][j].second);
for(int j=0;j<r[i].size();j++)c[r[i][j].first]=min(c[r[i][j].first],r[i][j].second);
}
printf(“%lld”,ans==c[0]?-1:ans);
return 0;
}
