//#include <bits/stdc++.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <stack>
#include <iomanip>
#include <numeric>
#include <cmath>
#include <string>
#define rep(i,n) for(ll i = 0; i < n; i++) //[0,n)
#define srep(i,a,b) for(ll i = a; i < b; i++) //[a,b)
#define arep(i,a,b,d) for(ll i = a; i < b; i += d)
#define all(A) (A).begin(),(A).end()
#define rall(A) (A).rbegin(),(A).rend()
#define pmt(A) next_permutation(all(A))
using namespace std;
using ll = long long;
using ull = unsigned long long;
const ll inf = 1LL<<60;
const int iinf = (int)1e9+1;
const int mod9 = 998244353;
const int mod1 = 1000000007;
struct Edge { int to; long long cost; int from; };
using Graph = vector<vector<int>>;
using SGraph = vector<set<ll>>;
template <class T>
int siz(T& a){return (int)a.size();}
ll squa(ll a){ return a*a; }
double torad(double x){ return x*(acos(-1)/180.0); }
ll cross(ll ax,ll ay,ll bx,ll by){ return ax*by-ay*bx; }
ll mceil(ll a,ll b){ return (a+b-1)/b; }

int main(){
    int N,Q; cin >> N >> Q;
    vector<int> A(N),B(Q);
    rep(i,N) cin >> A[i];
    rep(i,Q) cin >> B[i];

    vector<int> li(21,-1),ri(21,-1),seen(21,0);
    rep(i,N){
        if(seen[A[i]]) ri[A[i]] = i;
        else li[A[i]] = i;

        seen[A[i]] = 1;
    }
    
    int ans = 8000;
    rep(i,1<<Q){
        vector<int> ch;
        rep(j,Q){
            if(ri[B[j]] == -1){
                ch.push_back(li[B[j]]);
                continue;
            }
            
            if(i & 1<<j) ch.push_back(ri[B[j]]);
            else ch.push_back(li[B[j]]);
        }
        
        int res = ch[0];
        rep(j,Q-1) res += abs(ch[j]-ch[j+1]);

        ans = min(ans,res);
    }

    cout << ans;
}