//#define NDEBUG
#include <cstddef>
#include <cstdint>
#include <vector>

namespace n91 {

using i8 = std::int_fast8_t;
using i32 = std::int_fast32_t;
using i64 = std::int_fast64_t;
using u8 = std::uint_fast8_t;
using u32 = std::uint_fast32_t;
using u64 = std::uint_fast64_t;
using isize = std::ptrdiff_t;
using usize = std::size_t;

constexpr usize operator"" _z(unsigned long long x) noexcept {
  return static_cast<usize>(x);
}

class rep {
  const usize f, l;

public:
  class itr {
    friend rep;
    usize i;
    constexpr itr(const usize x) noexcept : i(x) {}

  public:
    void operator++() noexcept { ++i; }
    constexpr usize operator*() const noexcept { return i; }
    constexpr bool operator!=(const itr x) const noexcept { return i != x.i; }
  };
  constexpr rep(const usize first, const usize last) noexcept
      : f(first), l(last) {}
  constexpr itr begin() const noexcept { return itr(f); }
  constexpr itr end() const noexcept { return itr(l); }
};
class revrep {
  const usize f, l;

public:
  class itr {
    friend revrep;
    usize i;
    constexpr itr(usize x) noexcept : i(x) {}

  public:
    void operator++() noexcept { --i; }
    constexpr usize operator*() const noexcept { return i; }
    constexpr bool operator!=(const itr x) const noexcept { return i != x.i; }
  };
  constexpr revrep(usize first, usize last) noexcept : f(--first), l(--last) {}
  constexpr itr begin() const noexcept { return itr(l); }
  constexpr itr end() const noexcept { return itr(f); }
};
template <class T> using vec_alias = std::vector<T>;
template <class T> auto md_vec(const usize n, const T &value) {
  return std::vector<T>(n, value);
}
template <class... Args> auto md_vec(const usize n, Args... args) {
  return std::vector<decltype(md_vec(args...))>(n, md_vec(args...));
}
template <class T> constexpr T difference(const T &a, const T &b) {
  return a < b ? b - a : a - b;
}

} // namespace n91

#include <algorithm>
#include <iostream>
#include <utility>

namespace n91 {

void main_() {
  usize n, m;
  std::cin >> n >> m;
  auto d = md_vec(n, n, static_cast<u64>(0));
  for (const auto i : rep(0_z, m)) {
    usize a, b;
    u64 c;
    std::cin >> a >> b >> c;
    --a;
    --b;
    d[a][b] = std::max(d[a][b], c);
    d[b][a] = std::max(d[b][a], c);
  }

  auto dp = md_vec(1_z << n, n, static_cast<u64>(0));
  for (const auto u : rep(0_z, n)) {
    for (const auto v : rep(0_z, n)) {
      dp[1_z << u][v] = d[u][v];
    }
  }

  u64 ans = static_cast<u64>(0);

  for (const auto s : rep(0_z, 1_z << n)) {
    for (const auto from : rep(0_z, n)) {
      if ((s >> from & 1_z) == 1_z) {
        continue;
      }
      if (dp[s][from] == static_cast<u64>(0)) {
        continue;
      }
      ans = std::max(ans, dp[s][from]);
      const usize t = s | 1_z << from;
      for (const auto to : rep(0_z, n)) {
        if ((t >> to & 1_z) == 1_z) {
          continue;
        }
        if (d[from][to] == static_cast<u64>(0)) {
          continue;
        }
        dp[t][to] = std::max(dp[t][to], dp[s][from] + d[from][to]);
      }
    }
  }

  std::cout << ans << std::endl;
}

} // namespace n91

int main() {
  n91::main_();
  return 0;
}