use std::io::{Read,stdin};

fn main() {
    let mut buf = String::new();
    stdin().read_to_string(&mut buf).unwrap();
    let mut tok = buf.split_whitespace();
    let mut get = || tok.next().unwrap();
    macro_rules! get {
        ($t:ty) => (get().parse::<$t>().unwrap());
        () => (get!(i64));
    }
    
    // たぶん MST だと思うけど、面倒になった
    
    let n = get!(usize);
    let m = get!();
    let k = get!();
    
    let mut graph = vec![vec![]; n];
    let mut road = vec![];
    let mut total = 0;
    for _ in 0..m {
        let a = get!(usize)-1;
        let b = get!(usize)-1;
        let c = get!();
        graph[a].push((c, b));
        graph[b].push((c, a));
        road.push((a, b, c));
        total += c;
    }
    let mut flag = vec![false; n];
    for _ in 0..k {
        let e = get!(usize) - 1;
        let (a, b, c) = road[e];
        total -= c;
        flag[a] = true;
        flag[b] = true;
    }
    
    println!("{}", total);
}