#include <iostream>
#include <fstream>
#define pinf 20000000
using namespace std;
ifstream fin("hamilton.in");
ofstream fout("hamilton.out");
int d[262160][20],N,M,a[20][20],minn;
int main()
{
    int i,j,x,y,c,k,aux;
    fin>>N>>M;
    for(i=1; i<=M; i++)
    {
        fin>>x>>y>>c;
        a[x][y]=c;
    }
    for(i=3; i<=(1<<N)-1; i=i+2)
    {
        for(j=1; j<N; j++)
        {
            if((i&(1<<j))==(1<<j))
            {
                d[i][j]=pinf;
                aux=i-(1<<j);
                if(aux==1)
                {
                    if(a[0][j]!=0)
                        d[i][j]=a[0][j];
                    else
                        d[i][j]=pinf;
                }
                else
                {
                    for(k=1; k<N; k++)
                    {
                        if(((aux&(1<<k))==(1<<k)))
                        {
                            if(a[k][j]!=0)
                                d[i][j]=min(d[i][j],d[aux][k]+a[k][j]);
                        }
                    }
                }
            }
        }
    }
    minn=pinf;
    i=(1<<N)-1;
    for(j=1; j<N; j++)
    {
        if(a[j][0]!=0)
            minn=min(minn,d[i][j]+a[j][0]);
    }
    if(minn!=pinf)
        fout<<minn;
    else
        fout<<"Nu exista solutie";
}