def main():
    import sys
    input = sys.stdin.read().split()
    idx = 0
    N = int(input[idx])
    idx += 1
    M = int(input[idx])
    idx += 1
    adj = [[] for _ in range(N)]
    for _ in range(M):
        a = int(input[idx]) - 1
        idx += 1
        b = int(input[idx]) - 1
        idx += 1
        c = int(input[idx])
        idx += 1
        adj[a].append((b, c))
        adj[b].append((a, c))
    
    INF = -1
    max_mask = 1 << N
    dp = [[INF] * N for _ in range(max_mask)]
    for u in range(N):
        mask = 1 << u
        dp[mask][u] = 0
    
    from collections import defaultdict
    masks_by_bitcount = defaultdict(list)
    for mask in range(max_mask):
        cnt = bin(mask).count('1')
        masks_by_bitcount[cnt].append(mask)
    
    max_length = 0
    
    for cnt in sorted(masks_by_bitcount.keys()):
        for mask in masks_by_bitcount[cnt]:
            for u in range(N):
                if not (mask & (1 << u)) or dp[mask][u] == INF:
                    continue
                current_len = dp[mask][u]
                for v, c in adj[u]:
                    if mask & (1 << v):
                        continue
                    new_mask = mask | (1 << v)
                    new_len = current_len + c
                    if new_len > dp[new_mask][v]:
                        dp[new_mask][v] = new_len
                        if new_len > max_length:
                            max_length = new_len
    
    print(max_length)

if __name__ == "__main__":
    main()