50 50
75 71 23 37 28 23 69 75 5 62 3 11 96 100 13 50 57 51 8 90 4 6 84 27 11 89 95 81 10 62 48 52 69 87 97 95 30 74 21 42 36 64 31 80 81 50 56 53 33 99
26 30 5 33 35 29 6 15 36 17 32 16 14 1 29 34 22 40 12 42 38 48 39 50 13 47 18 43 10 8 49 45 11 31 21 37 46 28 20 41 2 7 9 24 27 23 3 44 15 14
 10 10
61 59 97 16 2 94 57 48 91 93
2 8 6 5 3 1 3 4 9 10
 2 1
1 2
1
 3 3
10 20 30
1 2 3
 50 60
86 57 45 93 17 12 40 10 47 80 18 80 3 9 6 55 13 99 5 76 4 70 100 55 27 91 71 3 65 93 41 74 80 56 90 50 58 13 71 9 47 52 26 73 72 21 15 81 88 28
40 32 5 16 49 23 3 17 14 10 1 15 1 21 28 22 13 45 12 25 44 48 46 32 36 43 11 8 49 7 7 35 10 14 39 4 42 10 30 27 1 17 31 15 8 41 44 33 25 26 19 18 29 37 50 6 36 38 47 9
 2 7
20 30
1 1 1 2 2 2 2
 2 2
10 12
2 1
 5 1
16 87 36 16 81
3
 2 3
20 30
1 1 1
 2 10
39 26
1 1 2 2 2 2 2 2 1 2

63929
 2137
 0
 40
 62514
 20
 12
 0
 0
 104

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.Iterator;
import java.util.Vector;
public class Bookreading {
    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String brr[]=br.readLine().trim().split(" ");
        int n=Integer.parseInt(brr[0]);
        int m=Integer.parseInt(brr[1]);
        Vector v=new Vector(m);
       int weight[]=new int[n];
       int books[]=new int[m];
        brr=br.readLine().trim().split(" ");
        int i;
        Iterator it=v.iterator();
        for(i=0;i<n;i++)
        {
            weight[i]=Integer.parseInt(brr[i]);
        }
        brr=br.readLine().trim().split(" ");
        for(i=0;i<m;i++)
        {
            books[i]=Integer.parseInt(brr[i]);
        }
        int k,sum=0,j;
        for(i=0;i<m;i++)
        {
            int ctr=0;
            if(v.isEmpty())
            {
                v.add(books[i]);
               // System.out.println((weight[books[i]-1));
                
            }
            else 
            {
                for(j=v.indexOf(v.lastElement());j>=v.indexOf(v.firstElement());j--)
                {
                    //System.out.println(j);
                    k=(int) v.get(j);
                   // System.out.println(k);
                    ctr++;
                    if (k==books[i])
                    {
                       //  System.out.println((v.indexOf(v.firstElement())+v.size()-ctr));
                        // System.out.println(v.elementAt(4));
                        v.remove(v.indexOf(v.firstElement())+v.size()-ctr);
                        //System.out.println(v.elementAt(4));
                        break;
                    }
                    else
                    {
                        // System.out.println();
                        sum+=weight[k-1];
                          // System.out.println(sum);
                    }
                }
               // System.out.println(v.lastElement());
                //System.out.println(v.size());
                v.add(books[i]);
                 // System.out.println(v.lastElement());
                //System.out.println(v.size());
            }
        }
        System.out.println(sum);
    }
}
            
            
    
