#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
using vi = vector<i64>;
using vvi = vector<vi>;

int main() {
    int v, e;
    cin >> v >> e;
    using ii = pair<int, i64>;
    vector<vector<ii>> adj(v);
    for (int i = 0; i < e; i++) {
        int s, t, d;
        cin >> s >> t >> d;
        adj[s].push_back(ii(t, d));
    }

    vvi dp(1 << v, vi(v, 1e18));
    // dp[i][j]: すでにiを回って今jにいる
    dp[0][0] = 0;
    for (int i = 0; i < 1 << v; i++) {
        for (int j = 0; j < v; j++) {
            for (auto &p: adj[j]) {
                if ((i >> p.first) & 1) continue;
                dp[i | (1 << p.first)][p.first] = min(dp[i | (1 << p.first)][p.first], dp[i][j] + p.second);
            }   
        }
    }
    cout << (dp[(1 << v) - 1][0] == 1e18 ? -1 : dp[(1 << v) - 1][0]) << endl;
}
