#[macro_export]
macro_rules! setup {
    { mut $input:ident: SplitWhitespace $(,)? } => {
        use std::io::Read;
        let mut buf = String::new();
        std::io::stdin().read_to_string(&mut buf).ok();
        let mut $input = buf.split_whitespace();
    };
}

#[macro_export]
macro_rules! parse_next {
    ($str_iter:expr) => {
        $str_iter.next().unwrap().parse().ok().unwrap()
    };
}

use std::collections::HashMap;

fn main() {
    setup! { mut input: SplitWhitespace };

    let n: usize = parse_next!(input);
    let m: usize = parse_next!(input);
    let mut board = HashMap::new();
    (0..m).for_each(|_| {
        let i: usize = parse_next!(input);
        let j: usize = parse_next!(input);
        let s: usize = parse_next!(input);
        board.insert((i, j), s);
    });

    let ans = (|| {
        let mut dp = vec![0; 1 << n];
        for src in 0..(1 << n) {
            for i in 0..n {
                if (src >> i) & 1 == 0 {
                    let mut score = dp[src];
                    for j in 0..n {
                        if (src >> j) & 1 == 1 {
                            if let Some(s) = board.get(&(i, j)) {
                                score += s;
                            }
                        }
                    }
                    let dest = src | (1 << i);
                    dp[dest] = dp[dest].max(score);
                }
            }
        }
        dp[(1 << n) - 1]
    })();

    println!("{}", ans);
}