#include <bits/stdc++.h>
#define INF 2147483647
#define INF_LL 9223372036854775807
#define MOD 1000000007
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;

vector<vector<int> > mat;
int N, M;

int dfs(int pos, int dist, vector<bool> used) {
	int tmp = dist;
	for (int i = 0; i < N; i++) {
		if (mat[pos][i] != -1 && !used[i]) {
			used[i] = true;
			tmp = max(tmp, dfs(i, dist + mat[pos][i], used));
			used[i] = false;
		}
	}
	return tmp;
}
int main() {
	cin >> N >> M;
	mat = vector<vector<int> >(N, vector<int>(N, -1));
	for (int i = 0; i < M; i++) {
		int a, b, c;
		cin >> a >> b >> c;
		a--; b--;
		mat[a][b] = mat[b][a] = c;
	}
	int ans = -1;
	for (int i = 0; i < N; i++) {
		vector<bool> tmp(N, false);
		tmp[i] = true;
		ans = max(ans,dfs(i, 0, tmp));
	}
	cout << ans << endl;
}