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

#include <bits/stdc++.h>
using namespace std;
const int maxint = 2147483647;
int ctoi(const char c) { return c - '0'; }
char itoc(const int n) { return n + '0'; }
template <typename T>
bool in(T x, T l, T r) {
  return l <= x && x <= r;
}
namespace extendedIO {
const unsigned int ssize = 256;
const char SP = ' ';
const char CR = '\n';
void write(const int n) { printf("%d", n); }
void write(const unsigned int n) { printf("%u", n); }
void write(const long long n) { cout << n; }
void write(const double a) { printf("%f", a); }
void writef(const double a, int n) { printf("%.*f", n, a); }
void write(const char c) { printf("%c", c); }
void write(const char s[] = "") { printf("%s", s); }
void writes(const int *a, const int l, const int r) {
  for (int i = l; i <= r; i++) printf("%d ", a[i]);
}
template <unsigned int n>
void write(const int (&a)[n]) {
  for (unsigned int i = 0; i < n; i++) printf("%d ", a[i]);
}
template <typename T>
void write(const T a) {
  for (__typeof a.begin() i = a.begin(); i != a.end(); i++) printf("%d ", *i);
}
void writeln() { write(CR); }
template <typename T>
void writeln(const T &a) {
  write(a);
  write(CR);
}
void writesln(const int *a, const int l, const int r) {
  for (int i = l; i <= r; i++) printf("%d ", a[i]);
  writeln(CR);
}
int read(int &n) {
  n = 0;
  int c;
  while (c = getchar(), in(c, 48, 57)) n = 10 * n + ctoi(c);
  return c;
}
int read(long long &n) {
  n = 0;
  int c;
  while (c = getchar(), in(c, 48, 57)) n = 10 * n + ctoi(c);
  return c;
}
int getint() {
  int n;
  if (read(n) != 45) return n;
  read(n);
  return -n;
}
template <unsigned int n>
void read(int (&a)[n]) {
  for (unsigned int i = 0; i < n; i++) a[i] = getint();
}
void read(int *a, int l, int r) {
  for (int i = l; i <= r; i++) a[i] = getint();
}
void read(vector<int> &v, int n) {
  v.clear();
  for (int i = 0; i < n; i++) v.push_back(getint());
}
void read(string &str, const unsigned int length = ssize) {
  char c, s[length];
  int i = 0;
  while (c = getchar(), c != SP && c != CR) s[i++] = c;
  str = string(s);
}
string readstr(const unsigned int length = ssize) {
  string s;
  read(s, length);
  return s;
}
}  // namespace extendedIO
using namespace extendedIO;
template <typename T>
void clr(T &a) {
  memset(a, 0, sizeof a);
}
template <typename T>
T gcd(T a, T b) {
  return (b ? gcd(b, a % b) : a);
}
template <typename T>
T lcm(T a, T b) {
  return a / gcd(a, b) * b;
}
vector<int> f;
bool cmp(const pair<int, int> &p1, const pair<int, int> &p2) {
  return f[p1.second] < f[p2.second];
}
int main() {
  int n = getint();
  int m = getint();
  vector<pair<int, int> > a;
  vector<int> b(m);
  for (int i = 1; i <= n; i++) a.push_back(pair<int, int>(getint(), i));
  read(b, m);
  f.resize(n + 1, -1);
  for (int i = 0; i < m; i++)
    if (f[b[i]] == -1) f[b[i]] = i;
  sort(a.begin(), a.end(), cmp);
  int sum = 0;
  for (int i = 0; i < m; i++) {
    int j = 0;
    while (a[j].second != b[i]) {
      sum += a[j].first;
      j++;
    }
    pair<int, int> t = a[j];
    for (int k = j; k > 0; k--) a[k] = a[k - 1];
    a[0] = t;
  }
  writeln(sum);
  return 0;
}
