from collections import defaultdict
from itertools import combinations


def solve(N, M, items2score):
    dp = [-float("inf")] * (1 << N)
    dp[0] = 0
    for V in range(1 << N):
        for i in range(N):
            if (V >> i) & 1:
                continue
            s = 0
            for j in range(N):
                if (V >> j) & 1:
                    s += items2score[(j, i)]
            VV = V | (1 << i)
            dp[VV] = max(dp[VV], dp[V] + s)

    return dp[-1]


def main():
    N, M = map(int, input().split())
    items2socre = defaultdict(int)
    for _ in range(M):
        i, j, s = map(int, input().split())
        items2socre[(i, j)] = s
    ans = solve(N, M, items2socre)
    print(ans)


if __name__ == "__main__":
    main()