#include <fstream>
#include <vector>
const std::string programName = "hamilton";
std::ifstream f(programName + ".in");
std::ofstream g(programName + ".out");
const int MAX = 18, INF = 0x3f3f3f3f;
int Cost[1 << MAX][MAX];
int main() {
    int N, M;
    f >> N >> M;
    std::vector < std::pair<int, int> > Graph[MAX];
    while (M--) {
        int x, y, c;
        f >> x >> y >> c;
        Graph[x].emplace_back(y, c);
    }
    for (int i = 0 ; i < (1 << N); ++i)
        for (int j = 0; j < N; ++j)
            Cost[i][j] = INF;
    Cost[1][0] = 0;
    for (int conf = 2; conf < (1 << N); ++conf)
        for (int last = 0; last < N; ++last)
            if (conf & (1 << last)) {
                int previous = conf ^ (1 << last);
                for (auto it : Graph[last])
                    if(previous & (1 << it.first))
                        Cost[conf][last] = std::min(Cost[conf][last], Cost[previous][it.first] + it.second);
            }
    int answer = INF;
    for (auto it : Graph[0])
        answer = std::min(answer, Cost[(1 << N) - 1][it.first] + it.second);
    if (answer == INF)
        g << "Nu exista solutie";
    else
        g << answer << "\n";
    return 0x0;
}