#include <vector>
#include <fstream>
 
using std::vector;
std::ifstream fin("hamilton.in");
std::ofstream fout("hamilton.out");

int main(){
    int n,m;
    fin >> n >> m;
    vector<vector<int>> v(n), c(n, vector<int>(n, 1e9));
    for(int i = 0; i < m; i++){
        int x, y, cost;
        fin >> x >> y >> cost;
        v[y].push_back(x);
        c[x][y] = cost;
    }

    vector<vector<int>> dp(1 << n, vector<int>(n, 1e9));
    
    dp[1][0] = 0;
    int nr = 1 << n;
    for(int mask = 3; mask < nr; mask += 2)
        for(int i = 1; i < n; i++)
            if(mask & (1 << i))
                for(int j : v[i])
                       dp[mask][i] = std::min(dp[mask][i], dp[mask ^ (1 << i)][j] + c[j][i]);

                
            
        
    
    int sol = 1e9;
    for(int i = 1; i < n; i++){
         sol = std::min(sol, dp[nr-1][i]+c[i][0]);
    }

    if(sol == 1e9){
        fout << "Nu exista solutie\n";
    }else{
        fout << sol<<"\n";
    }
    fout.close();
    return 0;
}