N,Q=map(int,input().split())
A=list(map(int,input().split()))
B=list(map(int,input().split()))
from collections import defaultdict
D=defaultdict(list)
for i,a in enumerate(A):
    D[a].append(i)
dp=[[1<<60 for _ in range(N)] for _ in range(Q+1)]
dp[0][0]=0
for i,b in enumerate(B,1):
    for j in range(N):
        if dp[i-1][j]<1<<60:
            for v in D[b]:
                dp[i][v]=dp[i-1][j]+abs(v-j)
ans=1<<60
for j in range(N):
    ans=min(ans,dp[Q][j])
print(ans)