#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <vector>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <map>
#include <set>
#include <list>
#include <unordered_set>
#include <unordered_map>
#include <stdlib.h>

using namespace std;
 
typedef long long i64;
typedef pair<i64, i64> P;

template<class T>
const T INF = numeric_limits<T>::max();
template<class T>
const T SINF = numeric_limits<T>::max() / 10;
static const i64 MOD = 1000000007;

//int dx[4] = {0,1,0,-1}, dy[4] = {-1,0,1,0};
//int dx[5] = {-1,0,0,0,1}, dy[5] = {0,-1,0,1,0};
//int dx[8] = {-1,0,1,1,1,0,-1,-1}, dy[8] = {1,1,1,0,-1,-1,-1,0};
//int dx[9] = {-1,0,1,1,1,0,-1,-1,0}, dy[9] = {1,1,1,0,-1,-1,-1,0,0};

struct edge {
	i64 from, to, cost;
	edge(i64 to, i64 cost) : from(-1), to(to), cost(cost) {}
	edge(i64 src, i64 to, i64 cost) : from(src), to(to), cost(cost) {}
};

template<typename T>
vector<T> make_v(size_t a){return vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
	return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

template<typename T,typename V>
typename enable_if<is_class<T>::value==0>::type
fill_v(T &t,const V &v){t=v;}

template<typename T,typename V>
typename enable_if<is_class<T>::value!=0>::type
fill_v(T &t,const V &v){
	for(auto &e:t) fill_v(e,v);
}

//-----end of template-----//

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);

	int n, m;
	cin >> n >> m;
	vector<int> item1(m), item2(m), score(m);
	for(int i = 0; i < m; ++i) cin >> item1[i] >> item2[i] >> score[i];

	vector<int> dp(1 << n, 0);
	for(int i = 0; i < (1 << n) - 1; ++i){
		for(int j = 0; j < n; ++j){
			if(i & (1 << j)) continue;
			int sum = 0;
			for(int k = 0; k < m; ++k){
				if((i & (1 << item1[k])) && item2[k] == j){
					sum += score[k];
				}
			}
			dp[i | (1 << j)] = max(dp[i | (1 << j)], dp[i] + sum);
		}
	}

	cout << dp[(1 << n) - 1] << endl;
}