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 math
import sys

def main():
    n, m = raw_input().split()	
    n, m = int(n), int(m)
    weights = [int(i) for i in raw_input().split()]
    order = [int(i) for i in raw_input().split()]
    ans = 0

    # make initial stack

    stack = []
    stack_set = {}

    for i in order:
        if i not in stack_set:
            stack_set[i] = i
            stack = [i] + stack
    if len(stack) != n:
        for i in range(n):
            if n not in stack_set:
                stack_set[i] = i
                stack = [i] + stack

    # start taking out and weighing things

    for book in order:
        (weight, new_stack) = lift_putback(stack, book, weights)
        stack = new_stack
        ans += weight

    return ans

def lift_putback(stack, book, weights):
    loc = stack.index(book)
    weight = 0
    for i in stack[loc+1:]:
        weight += weights[i-1]
    stack = stack[:loc] + stack[loc+1:] + [stack[loc]]
    return (weight, stack)
    

if __name__ == '__main__':
    print main()
