import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.NoSuchElementException;

public class Main {
	public static void main(String args[]) {
		FastScanner scanner = new FastScanner();
		int n=scanner.nextInt();
		int m=scanner.nextInt();
		int R=scanner.nextInt();
		int[] r=new int[R];
		for(int i=0;i<R;i++){
			r[i]=scanner.nextInt()-1;
		}
		graph=new long[n][n];
		for(int i=0;i<n;i++){
			Arrays.fill(graph[i], Integer.MAX_VALUE);
		}
		for(int i=0;i<m;i++){
			int a=scanner.nextInt()-1;
			int b=scanner.nextInt()-1;
			int c=scanner.nextInt();
			graph[a][b]=c;
			graph[b][a]=c;
		}
		warshallFloyd(n);
		Arrays.sort(r);
		int min=Integer.MAX_VALUE;
		do{
			int tmp=0;
			int pre=r[0];
			for(int i=1;i<R;i++){
				int now=r[i];
				tmp+=graph[now][pre];
				pre=now;
			}
			min=Math.min(min, tmp);
		}while(next_permutation(r));
		System.out.println(min);
	}
	static long[][] graph;
	static void warshallFloyd(int n) {
		for (int k = 0; k < n; k++) {
			for (int i = 0; i < n; i++) {
				for (int j = 0; j < n; j++) {
					graph[i][j] = Math.min(graph[i][j], graph[i][k] + graph[k][j]);
				}
			}
		}
	}
	private static boolean next_permutation(int[] p) {
		for (int a = p.length - 2; a >= 0; --a) {
			if (p[a] < p[a + 1]) {
				for (int b = p.length - 1;; --b) {
					if (p[b] > p[a]) {
						int t = p[a];
						p[a] = p[b];
						p[b] = t;
						for (++a, b = p.length - 1; a < b; ++a, --b) {
							t = p[a];
							p[a] = p[b];
							p[b] = t;
						}
						return true;
					}
				}
			}
		}
		return false;
	}
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}


Measured memory_bytes: 25044