#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=1; i<=(1<<(N-1))-1; i++)
    {
        for(j=0; j<N-1; j++)
        {
            if((i&(1<<j))==(1<<j))
            {
                d[i][j+1]=pinf;
                aux=i-(1<<j);
                if(aux==0)
                {
                    if(a[0][j+1]!=0)
                        d[i][j+1]=a[0][j+1];
                }
                else
                {
                    for(k=0; k<N-1; k++)
                    {
                        if(((aux&(1<<k))==(1<<k)))
                        {
                            if(a[k+1][j+1]!=0)
                                d[i][j+1]=min(d[i][j+1],d[aux][k+1]+a[k+1][j+1]);
                        }
                    }
                }
            }
        }
    }
    minn=pinf;
    i=(1<<(N-1))-1;
    for(j=0; j<N-1; j++)
    {
        if(a[j+1][0]!=0)
            minn=min(minn,d[i][j+1]+a[j+1][0]);
    }
    if(minn!=pinf)
        fout<<minn;
    else
        fout<<"Nu exista solutie";
}