class Main:
	N,M = 0,0
	score = [[]]
	used = []
	def __init__(self):
		pass

	def dfs(self,n,s):
		if n == self.N:
			lis = list(str(s))
			ret = 0
			for i in range(self.N):
				for j in range(i + 1,self.N):
					ret += self.score[int(lis[i])][int(lis[j])]
			return ret
		ret = 0
		for i in range(1,self.N + 1):
			if self.used[i]:
				continue
			self.used[i] = True
			ret = max(ret,self.dfs(n + 1,s * 10 + i))
			self.used[i] = False
		return ret
	def run(self):
		self.N,self.M = map(int,input().split())
		self.used = [False for i in range(self.N + 1)]
		self.score = [[0 for j in range(self.N + 1)]for i in range(self.N + 1)]
		for i in range(self.M):
			f,s,t = map(int,input().split())
			self.score[f + 1][s + 1] = t
		print(self.dfs(0,0))
if __name__ == '__main__':
	Main().run()