#pragma GCC optimize ("O2")
#pragma GCC target ("avx2")
#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;

using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please

const int SZ = 100001;
class UF {
public:
	int P[SZ + 1];
	UF() : P() {
		rep1(i, SZ) P[i] = -1;
	}
	int find(int A) {
		if (P[A] < 0) return A;
		return P[A] = find(P[A]);
	}
	bool unite(int A, int B) {
		int a = find(A);
		int b = find(B);
		if (a == b) return false;
		if (P[a] > P[b]) swap(a, b);
		P[a] += P[b];
		P[b] = a;
		return true;
	}
} uf;



int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	
	int N, M;
	cin >> N >> M;

	int kotae = 1e9;
	tuple<int, int, int> tp[100000];
	rep(i, M) {
		int s, t, d;
		cin >> s >> t >> d;
		tp[i] = tie(d, s, t);
	}
	sort(tp, tp + M);
	reverse(tp, tp + M);

#define PT pair<ll, int>
	vector<PT> E[200001];

	rep(i, M) if (uf.find(1) != uf.find(N)) {
		int d = get<0>(tp[i]);
		int s = get<1>(tp[i]);
		int t = get<2>(tp[i]);
		uf.unite(s, t);
		E[s].pb({ 1, t });
		E[t].pb({ 1, s });

		chmin(kotae, d);
	}

	ll D[100001];
	rep1(i, N) D[i] = 1e18;

	priority_queue<PT, vector<PT>, greater<PT>> que;
	D[1] = 0;
	que.push(mp(0, 1));
	while (que.size()) {
		PT p = que.top();
		que.pop();
		int i = p.second;
		if (D[i] != p.first) continue;
		for (PT p2 : E[i]) {
			int j = p2.second;
			ll d = D[i] + p2.first;
			if (D[j] > d) {
				D[j] = d;
				que.push(mp(d, j));
			}
		}
	}

	cosp(kotae);
	co(D[N]);

	Would you please return 0;
}