#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
N, M = map(int, readline().split())
m = map(int, read().split())
rules = zip(m, m, m)

# %%
item_score = [[0] * N for _ in range(N)]
for i, j, s in rules:
    item_score[j][i] = s


# %%
dp = [0] * (1 << N)
for n in range(1 << N):
    for i in range(N):
        if n & (1 << i):
            continue
        m = n ^ (1 << i)
        s = dp[n]
        for j, x in enumerate(item_score[i]):
            if n & (1 << j):
                s += x
        if dp[m] < s:
            dp[m] = s

# %%
print(dp[-1])