#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    vector<int> a(m), b(m), score(m);
    for(int i=0; i<m; ++i)
        cin >> a[i] >> b[i] >> score[i];

    vector<int> dp(1<<n, 0);
    for(int i=0; i<(1<<n); ++i){
        bitset<32> bs(i);
        for(int j=0; j<n; ++j){
            if(bs[j])
                continue;
            bs[j] = true;

            int add = 0;
            for(int k=0; k<m; ++k){
                if(bs[a[k]] && b[k] == j)
                    add += score[k];
            }
            dp[bs.to_ulong()] = max(dp[bs.to_ulong()], dp[i] + add);

            bs[j] = false;
        }
    }
    cout << dp[(1<<n)-1] << endl;

    return 0;
}