// compile: g++ -o data data.cpp -O3 -std=gnu++20 -Wall -Wextra -Wshadow -D_GLIBCXX_ASSERTIONS -ggdb3 -fmax-errors=2 -DLOCAL
// run: ./data < data.in
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#ifdef LOCAL
#include <debug/codeforces.h>
#define debug(x...) {_variables(#x);_print(x);}
#else
#define debug(x...)
#endif
template<typename...Args> void print_(Args...args){((cout<<args<<" "),...)<<endl;}
#define rep(i,a,b) for(int i=(a);i<(int)(b);++i)
#define sz(v) ((int)(v).size())
#define print(...) print_(__VA_ARGS__);
#define INTMAX (int)(9223372036854775807)
#define INTINF (int)(1152921504606846976)
#define int long long
#define MAXN 5010

int dp[MAXN][MAXN], mc[MAXN][MAXN];
int a[MAXN], c[MAXN], x[MAXN];
int n, m;

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

    memset(dp, 0xf, sizeof(dp));
    cin >> n >> m;
    rep(i, 1, n+1) cin >> a[i];
    rep(i, 1, n+1) cin >> c[i];
    rep(i, 1, n+1) {
        mc[i][i] = c[i];
        rep(j, i+1, n+1) mc[i][j] = min(mc[i][j-1], c[j]);
    }
    rep(i, 0, m) {
        int t; cin >> t;
        x[t] = 1;
    }
    dp[1][1] = a[1] + c[1];
    if (!x[1]) dp[1][0] = 0;
    rep(i, 2, n+1) {
        rep(j, 0, i) {
            dp[i][j+1] = min(dp[i][j+1], dp[i-1][j] + a[i] + mc[i-j][i]);
            if (!x[i]) dp[i][j] = min(dp[i][j], dp[i-1][j]);
        }
    }
    int ans = INTINF;
    rep(i, 0, n+1) ans = min(ans, dp[n][i]);
    cout << ans << endl;

    return 0;
}