#include <fstream>
#include <vector>
using namespace std;
ifstream cin ("hamilton.in");
ofstream cout ("hamilton.out");
int n,m;
int rasp = 2e9;
int d[20][20];
int dp[1<<18][20];
vector<int> g[20];
int calculare(int masca,int vf)
{
    if(dp[masca][vf]!=-1)
        return dp[masca][vf];
    dp[masca][vf] = 2e9;
    for(auto ult:g[vf])
    {
        if(((1<<ult) & masca)==0)
            continue;
        int nmasca = masca ^ (1<<vf);
        dp[masca][vf] = min(dp[masca][vf],calculare(nmasca,ult)+d[ult][vf]);
    }
    return dp[masca][vf];
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n,m;
    cin >> n >> m;
    for(int i=0;i<n;i++)
        for(int j=0;j<n;j++)
            d[i][j] = rasp;
    for(int i=0;i<(1<<n);i++)
        for(int j=0;j<n;j++)
            dp[i][j] = -1;
    for(int i=1;i<=m;i++)
    {
        int x,y,c;
        cin >> x >> y >> c;
        d[x][y] = c;
        g[y].push_back(x);
    }
    dp[1][0] = 0;
    for(auto vf:g[0])
        rasp = min( calculare((1<<n)-1,vf) + d[vf][0], rasp  );
    if(rasp==2e9)
    {
        cout << "Nu exista solutie";
        return 0;
    }
    cout << rasp;
    return 0;
}