#[allow(unused_imports)]
use std::char::from_digit;
#[allow(unused_imports)]
use std::cmp::{max, min};
#[allow(unused_imports)]
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, VecDeque};
#[allow(unused_imports)]
use std::fs::File;
#[allow(unused_imports)]
use std::io::prelude::*;
#[allow(unused_imports)]
use std::io::{stdin, stdout, BufReader, BufWriter, Stdin, Stdout, Write};
#[allow(unused_imports)]
use std::mem::swap;
#[allow(unused_imports)]
use std::str::FromStr;
 
type BoxResult<T> = Result<T, Box<std::error::Error>>;


fn main() {
    let mut scanner = Scanner::new(stdin());
    let line = scanner.read_vector::<usize>().unwrap();
    let (n, m, _r) = (line[0], line[1], line[2]);
    let towns = scanner.read_vector::<usize>().unwrap().into_iter().map(|val| val - 1).collect::<Vec<_>>();
    let mut adj = vec![vec![std::usize::MAX; n]; n];
    for _ in 0..m {
        let line = scanner.read_vector::<usize>().unwrap();
        let (a, b, c) = (line[0] - 1, line[1] - 1, line[2]);
        adj[a][b] = c;
        adj[b][a] = c;
    }
    warshall_floyd(&mut adj);
    println!("{}", solve(&towns, &adj));

}

fn warshall_floyd(adj: &mut Vec<Vec<usize>>) {
    for i in 0..adj.len() {
        for j in 0..adj.len() {
            if j == i {
                continue;
            }
            for k in 0..adj.len() {
                if k == j || k == i {
                    continue;
                }
                if adj[j][i] == std::usize::MAX || adj[i][k] == std::usize::MAX {
                    continue;
                }
                adj[j][k] = min(adj[j][i] + adj[i][k], adj[j][k]);
            }
        }
    }
}

fn solve(towns: &[usize], adj: &[Vec<usize>]) -> usize {
    let mut stack = vec![];
    for i in 0..towns.len() {
        stack.push((i, 1 << i, 0));
    }
    let mut min_cost = std::usize::MAX;
    while stack.len() > 0 {
        let (crt, used, cost) = stack.pop().unwrap();
        if used == (1 << towns.len()) - 1 {
            min_cost = min(cost, min_cost);
            continue;
        }
        for i in 0..towns.len() {
            if (used >> i) & 1 == 1 {
                continue;
            }
            stack.push((i, used | (1 << i), cost + adj[towns[crt]][towns[i]]));
        }
    }
    min_cost
}

#[allow(dead_code)]
struct Scanner<R> {
    reader: BufReader<R>,
    buffer: String,
}
impl<R> Scanner<R>
where
    R: Read,
{
    #[allow(dead_code)]
    fn new(inner: R) -> Scanner<R> {
        let reader = BufReader::new(inner);
        let buffer = String::new();
        Scanner {
            reader: reader,
            buffer: buffer,
        }
    }
    #[allow(dead_code)]
    fn with_capacity(capacity: usize, inner: R) -> Scanner<R> {
        let reader = BufReader::with_capacity(capacity, inner);
        let buffer = String::new();
        Scanner {
            reader: reader,
            buffer: buffer,
        }
    }
 
    #[allow(dead_code)]
    fn read_line(&mut self) -> BoxResult<String> {
        self.reader.read_line(&mut self.buffer)?;
        let cloned = self.buffer.trim().to_string();
        self.buffer.clear();
        Ok(cloned)
    }
 
    #[allow(dead_code)]
    fn read<T>(&mut self) -> BoxResult<T>
    where
        T: FromStr,
        T::Err: std::fmt::Debug,
        T::Err: std::error::Error,
        T::Err: 'static,
    {
        self.reader.read_line(&mut self.buffer)?;
        let parsed = self.buffer.trim().parse()?;
        self.buffer.clear();
        Ok(parsed)
    }
    #[allow(dead_code)]
    fn read_vector<T>(&mut self) -> BoxResult<Vec<T>>
    where
        T: FromStr,
        T::Err: std::fmt::Debug,
        T::Err: std::error::Error,
        T::Err: 'static,
    {
        self.reader.read_line(&mut self.buffer)?;
        let parsed_vec = self
            .buffer
            .trim()
            .split_whitespace()
            .map(|s| s.parse())
            .collect::<Result<Vec<_>, _>>()?;
        self.buffer.clear();
        Ok(parsed_vec)
    }
    #[allow(dead_code)]
    fn read_matrix<T>(&mut self, lines: usize) -> BoxResult<Vec<Vec<T>>>
    where
        T: FromStr,
        T::Err: std::fmt::Debug,
        T::Err: std::error::Error,
        T::Err: 'static,
    {
        let mut parsed_matrix = vec![];
        for _ in 0..lines {
            self.reader.read_line(&mut self.buffer)?;
            parsed_matrix.push(
                self.buffer
                    .trim()
                    .split_whitespace()
                    .map(|s| s.parse())
                    .collect::<Result<Vec<_>, _>>()?,
            );
            self.buffer.clear();
        }
        Ok(parsed_matrix)
    }
    #[allow(dead_code)]
    fn read_chars(&mut self) -> BoxResult<Vec<char>> {
        self.reader.read_line(&mut self.buffer)?;
        let chars = self.buffer.trim().chars().collect::<Vec<_>>();
        self.buffer.clear();
        Ok(chars)
    }
}

Measured memory_bytes: 4352