#include <fstream>
#include <vector>
#define MAXN 20
#define MAXX 262150
#define INF 100000000
using namespace std;
ifstream fin("hamilton.in");
ofstream fout("hamilton.out");

int N, M, Sol;
int Cost[MAXN][MAXN];
int C[MAXX][MAXN];
vector <int> A[MAXN];

int main() {
    fin >> N >> M;
    for (int i = 0; i < N; ++i)
        for (int j = 0; j < N; ++j)
            Cost[i][j] = INF;
    for (int i = 0; i < 1 << N; ++i)
        for (int j = 0; j < N; ++j)
            C[i][j] = INF;
    for (int i = 1; i <= M; ++i) {
        int x, y;
        fin >> x >> y;
        A[y].push_back(x);
        fin >> Cost[x][y];
    }

    C[1][0] = 0;
    for (int i = 0; i < 1 << N; ++i)
        for (int j = 0; j < N; ++j)
            if (i & (1<<j))
                for (int k = 0; k < A[j].size(); ++k)
                    if (i & (1<<A[j][k]))
                        C[i][j] = min(C[i][j], C[i ^ (1<<j)][ A[j][k] ] + Cost[ A[j][k] ][j]);

    Sol = INF;
    for (int i = 0; i < A[0].size(); ++i)
        Sol = min(Sol, C[(1<<N) - 1][ A[0][i] ] + Cost[ A[0][i] ][0]);

    if (Sol == INF)
        fout << "Nu exista solutie" << endl;
    else
        fout << Sol << endl;

    return 0;
}