const INF: isize = 1isize << 60;

fn main() {
    let mut nm = String::new();
    std::io::stdin().read_line(&mut nm).ok();
    let nm: Vec<usize> = nm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nm[0];
    let m = nm[1];
    let mut paths = vec![vec![-INF; n]; n];
    for _ in 0..m {
        let mut temp = String::new();
        std::io::stdin().read_line(&mut temp).ok();
        let temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let a = temp[0]-1;
        let b = temp[1]-1;
        let c = temp[2] as isize;
        paths[a][b] = paths[a][b].max(c);
        paths[b][a] = paths[b][a].max(c);
    }

    let mut dp = vec![vec![-INF; n]; 1<<n];
    for i in 0..n {
        dp[1usize<<i][i] = 0;
    }
    for i in 1..1<<n {
        for from in 0..n {
            if dp[i][from] == -INF { continue; }
            for to in 0..n {
                if ((i >> to) & 1) == 1 { continue; }
                if paths[from][to] == -INF { continue; }
                let nidx = i | (1 << to);
                dp[nidx][to] = dp[nidx][to].max(dp[i][from] + paths[from][to]);
            }
        }
    }
    println!("{}", dp.iter().map(|v| v.iter().max().unwrap()).max().unwrap());
}