#include <fstream>
#include <vector>
using namespace std;
ifstream fin("hamilton.in");
ofstream fout("hamilton.out");
const int NMax = 18;
const int oo = 1e9;
vector <int> G[NMax + 5];
int A[NMax + 5][NMax + 5];
int N,M,Sol=oo;
int DP[(1 << NMax) + 5][NMax + 5];
void Read()
{
    fin >> N >> M;
    for(int i  = 1; i <= M; ++i)
    {
        int x,y,c;
        fin >> x >> y >> c;
        G[y].push_back(x);
        A[x][y] = c;
    }
}

void Solve()
{
    for(int i = 1; i < (1 << N); ++i)
        for(int j = 0; j < N; ++j)
            DP[i][j] = oo;
    DP[1][0] = 0;
    for(int i = 1; i < (1 << N); ++i)
        for(int j = 0; j < N; ++j)
        {
            if(i & (1<<j))
                for(auto k : G[j])
                    DP[i][j] = min(DP[i][j],DP[i^(1<<j)][k] + A[k][j]);
        }
}

void Print()
{

    for(auto i : G[0])
        Sol = min(Sol,DP[(1 << N)-1][i] + A[i][0]);
    if(Sol == oo)
        fout << "Nu exista solutie";
    else
        fout << Sol << "\n";
}
int main()
{
    Read();
    Solve();
    Print();
    return 0;
}