N, Q = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))

data = []
current_index = 0

for idx, b in enumerate(B):
    if idx == 0:
        target_indexes = [i for i, j in enumerate(A) if j == b]
        res = []
        for index in target_indexes:
            cost = abs(index - current_index)
            res.append({"index": index, "cost": cost})
        data.append(res)
    else:
        current_indexes = data[idx - 1]
        target_indexes = [i for i, j in enumerate(A) if j == b]
        res = []
        for c_index in current_indexes:
            for t_index in target_indexes:
                cost = c_index["cost"] + abs(t_index - c_index["index"])
                res.append({"index": t_index, "cost": cost})
        data.append(res)

print(sorted(data[N - 2], key=lambda x: x["cost"])[0]["cost"])