#include <fstream>
#include <vector>
#include <bitset>

using namespace std;

ifstream in("hamilton.in");
ofstream out("hamilton.out");

#define MAX_VERTICES 18
#define MAX_COST 1000000
#define MAX_STATE 530000
#define INF 1000000000

int n, m, minimCost = MAX_COST * MAX_VERTICES, foundCycle;
vector <vector <pair <int,int> > > graph;
int dp[MAX_VERTICES][MAX_STATE + 1];
bool dpp[MAX_VERTICES][MAX_STATE + 1];

void readGraph()
{
    in >> n >> m;
    graph.resize(n + 1);
    for(int i = 1; i <= m; i ++)
    {
        int a, b, c;
        in >> a >> b >> c;
        graph[a].push_back({b, c});
    }
}

void printDpp()
{
    int stateNo = (1 << n) - 1;
    for(int mask = 1; mask <= stateNo; mask ++)
    {
        for(int i = 0; i < n; i++)
        {
            out << dpp[i][mask] << " ";
        }
        out << "\n";
    }
}

void hamilton()
{
    int startingNode = 0, initialMask, stateNo;

    stateNo = (1 << n) - 1;
    initialMask = 1 << startingNode;

     for(int mask = initialMask; mask <= stateNo; mask ++)
        for(int i = 0; i < n; i ++)
            dp[i][mask] = INF;
    dp[startingNode][initialMask] = 0;
    dpp[startingNode][initialMask] = 1;

//    printDpp();
    for(int mask = initialMask; mask <= stateNo; mask ++)
        for(int i = 0; i < n; i ++)
        {
            if(mask & (1 << i))
                for(auto x : graph[i])
                {
                    if((mask & (1 << x.first))  &&  dpp[i][mask - (1 << x.first)])
                    {
                        dpp[x.first][mask] = 1;
                        dp[x.first][mask] = dp[i][mask - (1 << x.first)] + x.second;
                    }
                }
        }
    for(int i = 0; i < n; i++)
        if(dpp[i][stateNo])
        {
            for (auto x : graph[i])
                if(x.first == startingNode)
                {
                    foundCycle = 1;
                    minimCost = min(minimCost, dp[i][stateNo] + x.second);
                }
        }
}

int main()
{
    readGraph();

    hamilton();

//    printDpp();
    if(foundCycle)
        out << minimCost;
    else
        out << "Nu exista solutie";
    return 0;
}