import std.stdio, std.string, std.conv, std.array, std.algorithm;
import std.uni, std.range, std.math, std.container, std.datetime;
import core.bitop;

immutable long MOD = 1_000_000_007;

void main(){
    char[] buf; readln(buf);
    auto input = buf.split.to!(int[]);
    auto N = input[0], M = input[1];
    auto st = new int[][](N, N);

    foreach(i ; 0 .. M){
        readln(buf);
        input = buf.split.to!(int[]);
        auto a = input[0], b = input[1], score = input[2];
        st[a][b] = score;
    }

    auto ans = bitDP(N, st);

    writeln(ans);
}

int bitDP(int N, int[][] st){
    auto uni = 2^^N - 1;
    auto dp = new int[][](uni + 1, N);

    foreach(s ; 0 .. uni + 1){
        foreach(v ; 0 .. N){
            auto s2 = s & (uni ^ 1<<v);

            foreach(u ; 0 .. N){
                if(s2 & 1<<u) dp[s][v] = max(dp[s][v], dp[s2][u] + st[u][v]);
            }
        }
    }

    return dp[uni].reduce!(max);
}