#include <iostream>
#include <fstream>
#define infinit 20000000
using namespace std;
ifstream fin("hamilton.in");
ofstream fout("hamilton.out");
int i,j,n,m,cost,nodant,minn,a[20][20],d[262600][20],k;
int main()
{
    fin>>n>>m;
    int minn=infinit;
    for(i=0;i<n;i++)
    {
        for(j=0;j<n;j++)
        {
            if(i==j)
            {
                a[i][j]=0;
            }
            else
            {
                 a[i][j]=infinit;
            }
        }
    }
    for(i=1;i<=m;i++)
    {
        fin>>i>>j>>cost;
        a[i][j]=cost;
    }
    for(i=3;i<=(1<<n)-1;i=i+2)
    {
        for(j=1;j<n;j++)
        {
            d[i][j]=infinit;
            if((i&(1<<j))!=0)
            {
                nodant=i-(1<<j);
                if(nodant==1)
                {
                    if(a[0][j]!=0)
                    {
                        d[i][j]=a[0][j];
                    }
                }
                else
                {
                    for(k=1;k<n;k++)
                    {
                        if((nodant&(1<<k))!=0&&a[k][j]!=0)
                        {
                            d[i][j]=min(d[i][j],d[nodant][k]+a[k][j]);
                        }
                    }
                }
            }
        }
    }
   /* for(i=1;i<(1<<n);i++)
    {
        for(j=0;j<n;j++)
        {
            cout<<d[i][j]<<" ";
        }
        cout<<endl;
    }*/
    nodant=(1<<n)-1;
    for(i=1;i<n;i++)
    {
        if(a[i][0]!=0&&d[nodant][i]!=infinit)
        {
            minn=min(minn,d[nodant][i]+a[i][0]);
        }
    }
    if(minn<infinit)
    {
        fout<<minn;
    }
    else
    {
        fout<<"Nu exista solutie";
    }
    return 0;
}