N, Q = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
now = 1
ans = 0
for b in B:
    index1, index2 = -1, -1
    if b in A[now - 1:]:
        index1 = A[now - 1:].index(b)
    if b in A[0:now]:
        index2 = A[::-1][len(A) - now:].index(b)
    d = 0
    if index1 < 0: 
        d = index2
        now -= d
    elif index2 < 0: 
        d = index1
        now += d
    else: 
        d = min(index1, index2)
        if d == index1:
            now += d
        else:
            now -= d
    ans += d
print(ans)