#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

long d[5000000];

main(){
	char*rp=mmap(0l,1l<<28,1,2,0,0ll);
	while(*rp++>=48);
	RD(f);
	RD(l);

	int b=f;
	do{
		RD(x);
		RD(v);
		RD(w);
		if(x>b){
			puts("-1");
			exit(0);
		}
		int c=b+v<x+f?b+v:x+f;
		int i=c;
		int j=c-v;
		for(;i>b;--i){
			d[i]=d[j]+w;
			j-=j>x;
		}
		for(;i>x;--i){
			d[i]=d[i]<d[j]+w?d[i]:d[j]+w;
			j-=j>x;
		}
		b=c;
	}while(*rp);
	if(l>b){
		puts("-1");
		exit(0);
	}
	printf("%ld",d[l]);
}