#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>
#include <limits>

static const int MOD = 998244353;
using ll = long long;
using uint = unsigned;
using ull = unsigned long long;
using namespace std;

template<class T> constexpr T INF = ::numeric_limits<T>::max() / 32 * 15 + 208;


vector<int> Z_algorithm(const vector<int> &s){
    vector<int> res(s.size());
    for (int i = 1, j = 0; i < s.size(); ++i) {
        if(i + res[i-j] < j + res[j]) res[i] = res[i-j];
        else {
            int k = max(0, j + res[j]-i);
            while(i + k < s.size() && s[k] == s[i+k]) ++k;
            res[i] = k;
            j = i;
        }
    }
    res.front() = s.size();
    return res;
}


int main() {
    int n, m;
    cin >> n >> m;
    vector<int> A(n);
    for (auto &&i : A) scanf("%d", &i);
    vector<int> B(m);
    for (auto &&i : B) scanf("%d", &i);
    vector<int> C(m);
    for (auto &&i : C) scanf("%d", &i);
    vector<ll> idx(m+2);
    iota(idx.begin(),idx.end(), 0);

    vector<int> AB(n+m+1);
    for (int i = 0; i < n; ++i) {
        AB[i] = A[i];
    }
    for (int i = 0; i < m; ++i) {
        AB[i+n] = B[i];
    }
    auto Z = Z_algorithm(AB);
    vector<ll> dp(m+1, INF<ll>);
    dp[0] = 0;
    for (int i = 0; i < m; ++i) {
        for (int j = i+1; j <= i+Z[n+i]; ++j) {
            if(dp[j] >= dp[i] + (ll)C[i]*(j-i)){
                dp[j] = dp[i] + (ll)C[i]*(j-i);
            }else break;
        }
    }
    if(dp[m] == INF<ll>) puts("-1");
    else cout << dp[m] << "\n";
    return 0;
}