//#pragma GCC optimize ("O3")

#include <bits/stdc++.h>
#include <iomanip>
#define DEBUG 1

using namespace std;

typedef long long LL;
typedef long double LD;
typedef pair<int, int> PII;
typedef pair<LL, LL> PLL;
typedef pair<LD, LD> PLDLD;
typedef vector<int> VI;
typedef vector<LL> VLL;
typedef vector<char> VB;

#define FOR(i,a,b) for(int i=(a);i<(int)(b);++i)
#define REP(i,n) FOR(i,0,n)
#define RFOR(i,a,b) for(int i=(a)-1;i>=(int)(b);--i)
#define RREP(i,n) RFOR(i,n,0)
#define CLR(a) memset((a), 0 ,sizeof(a))
#define ALL(a) a.begin(),a.end()
#define UNQ(a) a.erase(std::unique(ALL(a)),a.end());
#define endl "\n"

#define BEGIN_STACK(size) \
	void *dummy = malloc(size); \
	void *org_stack; \
	char *my = (char *)alloca((1 + (int)(((long long)dummy) & 127)) * 16); \
	*my = 0; \
	asm volatile("mov %%rsp, %%rbx\n" \
		"mov %%rax, %%rsp" \
		: "=b"(org_stack) \
		: "a"((char *)dummy + (size)-1024));

#define END_STACK \
	asm volatile("mov %%rax, %%rsp" ::"a"(org_stack)); \
	free(dummy);

const LD EPS=1e-10;
const long long INFLL=(LL)(1e9)*(LL)(1e9);
const int INF=1e9+7;

template<class T>
void chmin(T& a, const T b)
{
	if(a>b)
		a=b;
}
template<class T>
void chmax(T& a, const T b)
{
	if(a<b)
		a=b;
}

const LL powLL(const LL p, const LL q)
{
	LL t=1;
	for(int i=0;i<q;i++)
		t*=p;
	return t;
}

template <typename T>
struct has_iter
{
	private:
		template <typename U>
		static constexpr true_type check(typename U::iterator*);
		template <typename U>
		static constexpr false_type check(...);

	public:
		static constexpr bool value = decltype(check<T>(nullptr))::value;
};


template<typename T, typename U = typename T::iterator>
void print(const T& container)
{
		auto&& first=begin(container), last=end(container);
		auto&& back=prev(last);
		for(auto e=first; e!=last; e=next(e))
			cout<<*e<<" \n"[e==back];
}


extern void* enabler;
template<typename Head, typename enable_if<!has_iter<Head>::value>::type*& = enabler>
void print(const Head& head)
{
	cout<<head<<endl;
}

template<> void print<string>(const string& container)
{
	cout<<container<<endl;
}

template<typename Head, typename... Tail>
void print(const Head& head, const Tail&... tail)
{
	cout<<head<<" ";
	print(tail...);
}

template<typename... Args>
void printd(const Args&... args)
{
	#ifdef DEBUG
		print(args...);
	#endif
}

template<typename Head>
void input(Head& head)
{
	cin>>head;
}

template<typename Head, typename... Tail>
void input(Head& head, Tail&... tail)
{
	cin>>head;
	input(tail...);
}

void io_speedup()
{
	cin.tie(0);
	cout.tie(0);
	ios::sync_with_stdio(false);
}

template<typename T>
istream& operator >> (istream& is, vector<T>& vec)
{
	for(T& x: vec) is >> x;
	return is;
}


template<typename T, typename U>
istream& operator >> (istream& is, pair<T, U>& t)
{
	is>>t.first>>t.second;
	return is;
}

template<int N, typename... Ts, typename enable_if<N == sizeof...(Ts)-1>::type*& = enabler>
void tuple_in(istream &is, tuple<Ts...> &t)
{
	is>>get<N>(t);
}
template<int N, typename... Ts, typename enable_if<N < sizeof...(Ts)-1>::type*& = enabler>
void tuple_in(istream &is, tuple<Ts...> &t)
{
	is>>get<N>(t);
	tuple_in<N+1, Ts...>(is, t);
}

template<typename... Ts>
istream& operator >> (istream& is, tuple<Ts...>& t)
{
	tuple_in<0, Ts...>(is, t);
	return is;
}


template<typename T, typename U>
ostream& operator << (ostream& os, const pair<T, U>& t)
{
	os<<'('<<t.first<<", "<<t.second<<')';
	return os;
}

template<int N, typename... Ts, typename enable_if<N == sizeof...(Ts)-1>::type*& = enabler>
void tuple_out(ostream &os,const tuple<Ts...> &t)
{
	os<<get<N>(t);
}
template<int N, typename... Ts, typename enable_if<N < sizeof...(Ts)-1>::type*& = enabler>
void tuple_out(ostream &os,const tuple<Ts...> &t)
{
	os<<get<N>(t)<<", ";
	tuple_out<N+1, Ts...>(os, t);
}

template<typename... Ts>
ostream& operator << (ostream& os, const tuple<Ts...>& t)
{
	os<<'(';
	tuple_out<0, Ts...>(os, t);
	os<<')';
	return os;
}

template<typename T>
vector<T> read(int n)
{
	vector<T> t(n);
	cin>>t;
	return t;
}

template<typename T>
T read()
{
	T t;
	cin>>t;
	return t;
}


typedef LL Dist;

struct Edge;
typedef vector<Edge> Edges;
typedef vector<Edges> Graph;

struct Edge
{
    int to;
    Dist dist;
    Edge(int to_,Dist dist_):to(to_),dist(dist_)
    {}
    bool operator >(const Edge &ed)const
    {
        return dist > ed.dist;
    }
};

//Shortest cost from i to j.
vector<Dist> dijkstra(int i, const Graph &vertex, vector<int> &preVector)
{
    vector<int> pVector(vertex.size(), INF);
    vector<Dist> shortest(vertex.size(), INFLL);
    priority_queue<Edge, vector<Edge>, greater<Edge> > que;

    que.push(Edge(i, 0));
    shortest[i]=0;

    Edge state(0,0), tmp(0,0), e(0,0);
    while(!que.empty())
    {
        state = que.top();
        que.pop();
        if(shortest[state.to] < state.dist) continue;
        for(Edge e : vertex[state.to])
        {
            if(shortest[e.to] > shortest[state.to] + e.dist)
            {
                shortest[e.to] = shortest[state.to] + e.dist;
                pVector[e.to] = state.to;
                tmp = Edge(e.to, shortest[e.to]);
                que.push(tmp);
            }
        }
    }
    preVector = pVector;
    return shortest;
}

vector<int> get_path(int i, int j, const vector<int> &preVector)
{
    vector<int> rev;
    rev.push_back(j);
    int p=j;
    while(p!=i)
    {
        p = preVector[p];
        rev.push_back(p);
        if(p==INF)
            return vector<int>();
    }
    reverse(rev.begin(),rev.end());
    return rev;
}

vector<Dist> dijkstra(int i, const Graph &vertex)
{
  vector<int> preVector(vertex.size());
  return dijkstra(i, vertex, preVector);
}
Dist dijkstra(int i,int j, const Graph &vertex)
{
  return dijkstra(i, vertex)[j];
}
Dist dijkstra(int i,int j, const Graph &vertex, vector<int> &path)
{
  vector<int> preVector(vertex.size());
  vector<Dist> shortest(dijkstra(i, vertex, preVector));
  path = get_path(i, j, preVector);
  return shortest[j];
}

int main()
{
	int n,m;
	cin>>n>>m;
	Graph g(n);
	REP(i,m)
	{
		int l,r,c;
		cin>>l>>r>>c;
		l--;
		r--;
		g[l].push_back(Edge(r,c));
	}

	FOR(j,1,n)
		g[j].push_back(Edge(j-1,0));
	
	auto ans = dijkstra(0,n-1,g);
	if(ans==INFLL)
		ans=-1;

	print(ans);
}

Measured memory_bytes: 9980