#define _CRT_SECURE_NO_WARNINGS
#include "bits/stdc++.h"
#include <iostream>
#include <random>
#include <unordered_map>
#include <unordered_set>
#include <immintrin.h>
#ifdef _MSC_VER
#include <ppl.h>
#endif

using namespace std;

//呪文
#define DUMPOUT std::cerr
#define dump(...) DUMPOUT<<"  ";DUMPOUT<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"<<std::endl;DUMPOUT<<"    ";dump_func(__VA_ARGS__)

typedef unsigned uint; typedef long long ll; typedef unsigned long long ull; typedef pair<int, int> pii; typedef pair<ll, ll> pll; typedef pair<double, double> pdd; typedef pair<string, string> pss;
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const pair<_KTy, _Ty>& m) { o << "{" << m.first << ", " << m.second << "}"; return o; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const map<_KTy, _Ty>& m) { if(m.empty()) { o << "{ }"; return o; } o << "{" << *m.begin(); for(auto itr = ++m.begin(); itr != m.end(); itr++) { o << ", " << *itr; } o << "}"; return o; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const unordered_map<_KTy, _Ty>& m) { if(m.empty()) { o << "{ }"; return o; } o << "{" << *m.begin(); for(auto itr = ++m.begin(); itr != m.end(); itr++) { o << ", " << *itr; } o << "}"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const vector<_Ty>& v) { if(v.empty()) { o << "{ }"; return o; } o << "{" << v.front(); for(auto itr = ++v.begin(); itr != v.end(); itr++) { o << ", " << *itr; } o << "}"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const set<_Ty>& s) { if(s.empty()) { o << "{ }"; return o; } o << "{" << *(s.begin()); for(auto itr = ++s.begin(); itr != s.end(); itr++) { o << ", " << *itr; } o << "}"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const unordered_set<_Ty>& s) { if(s.empty()) { o << "{ }"; return o; } o << "{" << *(s.begin()); for(auto itr = ++s.begin(); itr != s.end(); itr++) { o << ", " << *itr; }	o << "}"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const stack<_Ty>& s) { if(s.empty()) { o << "{ }"; return o; } stack<_Ty> t(s); o << "{" << t.top(); t.pop(); while(!t.empty()) { o << ", " << t.top(); t.pop(); } o << "}";	return o; }
template <typename _Ty> ostream& operator << (ostream& o, const list<_Ty>& l) { if(l.empty()) { o << "{ }"; return o; } o << "{" << l.front(); for(auto itr = ++l.begin(); itr != l.end(); ++itr) { o << ", " << *itr; } o << "}"; return o; }
template <typename _KTy, typename _Ty> istream& operator >> (istream& is, pair<_KTy, _Ty>& m) { is >> m.first >> m.second; return is; }
template <typename _Ty> istream& operator >> (istream& is, vector<_Ty>& v) { for(size_t i = 0; i < v.size(); i++) is >> v[i]; return is; }
namespace aux { // print tuple
  template<typename Ty, unsigned N, unsigned L> struct tp { static void print(ostream& os, const Ty& v) { os << get<N>(v) << ", "; tp<Ty, N + 1, L>::print(os, v); } };
  template<typename Ty, unsigned N> struct tp<Ty, N, N> { static void print(ostream& os, const Ty& v) { os << get<N>(v); } };
}
template<typename... Tys> ostream& operator<<(ostream& os, const tuple<Tys...>& t) { os << "{"; aux::tp<tuple<Tys...>, 0, sizeof...(Tys) - 1>::print(os, t); os << "}"; return os; }

template<typename A, size_t N, typename T> inline void Fill(A(&array)[N], const T &val) { std::fill((T*)array, (T*)(array + N), val); }

void dump_func() { DUMPOUT << std::endl; }
template <class Head, class... Tail> void dump_func(Head&& head, Tail&&... tail) { DUMPOUT << head; if(sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ", "; } dump_func(std::move(tail)...); }

template<typename Ty>Ty modpow(Ty n, Ty e, Ty m) { Ty result = 1; while(e > 0) { if(e & 1)result = (result*n) % m; e >>= 1; n = (n*n) % m; }return result; }


#define PI 3.14159265358979323846
#define EPS 1e-10
#define FOR(i,a,n) for(int i=(a);i<(n);++i)
#define REP(i,n)  FOR(i,0,n)
#define all(j) (j).begin(), (j).end()
#define SZ(j) ((int)(j).size())
#define fake false



int INF = 1e8;
int n, d[15][15], dp[1<<15][15];
pii p[1<<15][15];
signed main(void)
{
  int m;
  cin >> n >> m;
  REP(i, n) REP(j, n) {
    d[i][j] = INF;
    p[i][j].first = p[i][j].second = -1;
  }
  REP(i, m) {
    int s, t, dd;
    cin >> s >> t >> dd;
    d[s][t] = dd;
  }
  REP(i, 1<<n) fill(dp[i], dp[i]+n, INF);
  dp[(1<<n)-1][0] = 0;
  for(int s=(1<<n)-2; s>=0; --s) {
    REP(v, n) REP(u, n) {
      if(!(s>>u&1)) { // s の u ビット目が下りている
        if(dp[s][v] > dp[s|1<<u][u]+d[v][u]){ // (s+{u} and last=u) -> (s and last=v)
          dp[s][v] = dp[s|1<<u][u] + d[v][u]; // v->u を採用
          p[s][v]=pii(s|1<<u, u);
        }
      }
    }
  }
  if(dp[0][0] >= INF) {
    cout << -1 << endl;
    return 0;
  }
  int s=0,u=0;
  vector<int> path;
  while(s!=(1<<n)-1){
    path.push_back(u);
    tie(s, u)=p[s][u];
    if(s==(1<<n)-1) break;
  }
  path.push_back(path.front());
  //cout << path << endl;
  cout << dp[0][0] << endl;
  return 0;
}


Measured memory_bytes: 8864