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#include <fstream>
using namespace std;
ifstream fin("gardieni.in");
ofstream fout("gardieni.out");
long long int N, T, a, b, c, Cheap[1000002], i, k, S;
int main()
{
fin>>N>>T;
for(i=0; i<N; i++){
fin>>a>>b>>c;
for(k=a; k<=b; k++){
if(Cheap[k]==0)Cheap[k]=c;
else if(Cheap[k]>c)Cheap[k]=c;
}
}
for(i=1; i<=T; i++)S+=Cheap[i];
fout<<S;
return 0;
}