#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <algorithm>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <unordered_map>
#include <functional>
#include <utility>
#include <tuple>
#include <cctype>
#include <bitset>
#include <complex>
#include <cmath>
#include <array>
#include <numeric>
using namespace std;
#define INF 0x3f3f3f3f
#define INFLL 0x3f3f3f3f3f3f3f3fLL
//#define MOD 998244353
#define MOD 1000000007
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define eb emplace_back
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pint;
typedef pair<ll,ll> pll;
typedef tuple<int,int,int> tint;
typedef vector<int> vint;
typedef vector<ll> vll;
typedef vector<ull> vull;
typedef vector<pint> vpint;
int dx[8]={0,0,-1,1,1,1,-1,-1};
int dy[8]={-1,1,0,0,1,-1,1,-1};
const int SIZE=100050;
//↑templete
// Segment Tree Beats
// - l<=i<r について、 A_i の値を min(A_i, x) に更新
// - l<=i<r について、 A_i の値を max(A_i, x) に更新
// - l<=i<r の中の A_i の最大値を求める
// - l<=i<r の中の A_i の最小値を求める
// - l<=i<r の A_i の和を求める
// - l<=i<r について、 A_i の値に x を加える
// - l<=i<r について、 A_i の値を x に更新

#define N 100050

class SegmentTree {
  const ll inf = 1e18;
  int n, n0;
  ll max_v[4*N], smax_v[4*N], max_c[4*N];
  ll min_v[4*N], smin_v[4*N], min_c[4*N];
  ll sum[4*N];
  ll len[4*N], ladd[4*N], lval[4*N];

  void update_node_max(int k, ll x) {
    sum[k] += (x - max_v[k]) * max_c[k];

    if(max_v[k] == min_v[k]) {
      max_v[k] = min_v[k] = x;
    } else if(max_v[k] == smin_v[k]) {
      max_v[k] = smin_v[k] = x;
    } else {
      max_v[k] = x;
    }

    if(lval[k] != inf && x < lval[k]) {
      lval[k] = x;
    }
  }
  void update_node_min(int k, ll x) {
    sum[k] += (x - min_v[k]) * min_c[k];

    if(max_v[k] == min_v[k]) {
      max_v[k] = min_v[k] = x;
    } else if(smax_v[k] == min_v[k]) {
      min_v[k] = smax_v[k] = x;
    } else {
      min_v[k] = x;
    }

    if(lval[k] != inf && lval[k] < x) {
      lval[k] = x;
    }
  }

  void push(int k) {

    if(n0-1 <= k) return;

    if(lval[k] != inf) {
      updateall(2*k+1, lval[k]);
      updateall(2*k+2, lval[k]);
      lval[k] = inf;
      return;
    }

    if(ladd[k] != 0) {
      addall(2*k+1, ladd[k]);
      addall(2*k+2, ladd[k]);
      ladd[k] = 0;
    }

    if(max_v[k] < max_v[2*k+1]) {
      update_node_max(2*k+1, max_v[k]);
    }
    if(min_v[2*k+1] < min_v[k]) {
      update_node_min(2*k+1, min_v[k]);
    }

    if(max_v[k] < max_v[2*k+2]) {
      update_node_max(2*k+2, max_v[k]);
    }
    if(min_v[2*k+2] < min_v[k]) {
      update_node_min(2*k+2, min_v[k]);
    }
  }

  void update(int k) {
    sum[k] = sum[2*k+1] + sum[2*k+2];

    if(max_v[2*k+1] < max_v[2*k+2]) {
      max_v[k] = max_v[2*k+2];
      max_c[k] = max_c[2*k+2];
      smax_v[k] = max(max_v[2*k+1], smax_v[2*k+2]);
    } else if(max_v[2*k+1] > max_v[2*k+2]) {
      max_v[k] = max_v[2*k+1];
      max_c[k] = max_c[2*k+1];
      smax_v[k] = max(smax_v[2*k+1], max_v[2*k+2]);
    } else {
      max_v[k] = max_v[2*k+1];
      max_c[k] = max_c[2*k+1] + max_c[2*k+2];
      smax_v[k] = max(smax_v[2*k+1], smax_v[2*k+2]);
    }

    if(min_v[2*k+1] < min_v[2*k+2]) {
      min_v[k] = min_v[2*k+1];
      min_c[k] = min_c[2*k+1];
      smin_v[k] = min(smin_v[2*k+1], min_v[2*k+2]);
    } else if(min_v[2*k+1] > min_v[2*k+2]) {
      min_v[k] = min_v[2*k+2];
      min_c[k] = min_c[2*k+2];
      smin_v[k] = min(min_v[2*k+1], smin_v[2*k+2]);
    } else {
      min_v[k] = min_v[2*k+1];
      min_c[k] = min_c[2*k+1] + min_c[2*k+2];
      smin_v[k] = min(smin_v[2*k+1], smin_v[2*k+2]);
    }
  }

  void _update_min(ll x, int a, int b, int k, int l, int r) {
    if(b <= l || r <= a || max_v[k] <= x) {
      return;
    }
    if(a <= l && r <= b && smax_v[k] < x) {
      update_node_max(k, x);
      return;
    }

    push(k);
    _update_min(x, a, b, 2*k+1, l, (l+r)/2);
    _update_min(x, a, b, 2*k+2, (l+r)/2, r);
    update(k);
  }

  void _update_max(ll x, int a, int b, int k, int l, int r) {
    if(b <= l || r <= a || x <= min_v[k]) {
      return;
    }
    if(a <= l && r <= b && x < smin_v[k]) {
      update_node_min(k, x);
      return;
    }

    push(k);
    _update_max(x, a, b, 2*k+1, l, (l+r)/2);
    _update_max(x, a, b, 2*k+2, (l+r)/2, r);
    update(k);
  }

  void addall(int k, ll x) {
    max_v[k] += x;
    if(smax_v[k] != -inf) smax_v[k] += x;
    min_v[k] += x;
    if(smin_v[k] != inf) smin_v[k] += x;

    sum[k] += len[k] * x;
    if(lval[k] != inf) {
      lval[k] += x;
    } else {
      ladd[k] += x;
    }
  }

  void updateall(int k, ll x) {
    max_v[k] = x; smax_v[k] = -inf;
    min_v[k] = x; smin_v[k] = inf;
    max_c[k] = min_c[k] = len[k];

    sum[k] = x * len[k];
    lval[k] = x; ladd[k] = 0;
  }

  void _add_val(ll x, int a, int b, int k, int l, int r) {
    if(b <= l || r <= a) {
      return;
    }
    if(a <= l && r <= b) {
      addall(k, x);
      return;
    }

    push(k);
    _add_val(x, a, b, 2*k+1, l, (l+r)/2);
    _add_val(x, a, b, 2*k+2, (l+r)/2, r);
    update(k);
  }

  void _update_val(ll x, int a, int b, int k, int l, int r) {
    if(b <= l || r <= a) {
      return;
    }
    if(a <= l && r <= b) {
      updateall(k, x);
      return;
    }

    push(k);
    _update_val(x, a, b, 2*k+1, l, (l+r)/2);
    _update_val(x, a, b, 2*k+2, (l+r)/2, r);
    update(k);
  }

  ll _query_max(int a, int b, int k, int l, int r) {
    if(b <= l || r <= a) {
      return -inf;
    }
    if(a <= l && r <= b) {
      return max_v[k];
    }
    push(k);
    ll lv = _query_max(a, b, 2*k+1, l, (l+r)/2);
    ll rv = _query_max(a, b, 2*k+2, (l+r)/2, r);
    return max(lv, rv);
  }

  ll _query_min(int a, int b, int k, int l, int r) {
    if(b <= l || r <= a) {
      return inf;
    }
    if(a <= l && r <= b) {
      return min_v[k];
    }
    push(k);
    ll lv = _query_min(a, b, 2*k+1, l, (l+r)/2);
    ll rv = _query_min(a, b, 2*k+2, (l+r)/2, r);
    return min(lv, rv);
  }

  ll _query_sum(int a, int b, int k, int l, int r) {
    if(b <= l || r <= a) {
      return 0;
    }
    if(a <= l && r <= b) {
      return sum[k];
    }
    push(k);
    ll lv = _query_sum(a, b, 2*k+1, l, (l+r)/2);
    ll rv = _query_sum(a, b, 2*k+2, (l+r)/2, r);
    return lv + rv;
  }

public:
  SegmentTree(int n) {
    SegmentTree(n, nullptr);
  }

  SegmentTree(int n, ll *a) : n(n) {
    n0 = 1;
    while(n0 < n) n0 <<= 1;

    for(int i=0; i<2*n0; ++i) ladd[i] = 0, lval[i] = inf;
    len[0] = n0;
    for(int i=0; i<n0-1; ++i) len[2*i+1] = len[2*i+2] = (len[i] >> 1);

    for(int i=0; i<n; ++i) {
      max_v[n0-1+i] = min_v[n0-1+i] = sum[n0-1+i] = (a != nullptr ? a[i] : 0);
      smax_v[n0-1+i] = -inf;
      smin_v[n0-1+i] = inf;
      max_c[n0-1+i] = min_c[n0-1+i] = 1;
    }

    for(int i=n; i<n0; ++i) {
      max_v[n0-1+i] = smax_v[n0-1+i] = -inf;
      min_v[n0-1+i] = smin_v[n0-1+i] = inf;
      max_c[n0-1+i] = min_c[n0-1+i] = 0;
    }
    for(int i=n0-2; i>=0; i--) {
      update(i);
    }
  }

  // range minimize query
  void update_min(int a, int b, ll x) {
    _update_min(x, a, b, 0, 0, n0);
  }

  // range maximize query
  void update_max(int a, int b, ll x) {
    _update_max(x, a, b, 0, 0, n0);
  }

  // range add query
  void add_val(int a, int b, ll x) {
    _add_val(x, a, b, 0, 0, n0);
  }

  // range update query
  void update_val(int a, int b, ll x) {
    _update_val(x, a, b, 0, 0, n0);
  }

  // range minimum query
  ll query_max(int a, int b) {
    return _query_max(a, b, 0, 0, n0);
  }

  // range maximum query
  ll query_min(int a, int b) {
    return _query_min(a, b, 0, 0, n0);
  }

  // range sum query
  ll query_sum(int a, int b) {
    return _query_sum(a, b, 0, 0, n0);
  }
};
int main(){
	int n,m;
	cin>>n>>m;
	
	vector<tint> edges;
	for(int i=0;i<m;i++){
		int l, r, c;
		cin>>l>>r>>c;
		l--;
		edges.eb(l,r,c);
	}
	sort(edges.begin(), edges.end());
	ll vec[N]={};
	for(int i=1;i<N;i++)
		vec[i]=INFLL;
	SegmentTree stb(N, vec);
	stb.update_max(0, 1, 0LL);
	stb.update_max(1, n+1, INFLL);
	for(auto t:edges){
		int l, r, c;
		tie(l, r, c)=t;

		ll temp=stb.query_min(l, r);
		//cout<<temp<<endl;
		stb.update_min(l, r, temp+c);
	}
	ll ans=stb.query_max(n-1, n);
	if(ans<1e17)
		cout<<ans<<endl;
	else
		cout<<-1<<endl;
	return 0;
}

Measured memory_bytes: 33524