#include <bits/stdc++.h> using namespace std; #define endl '\n' #define ll long long // #define int long long #define ld double #define pii pair<int,int> #define rand() abs((rand()<<15)|rand()) #define randll() abs(((long long)rand()<<30)|rand()) const int MOD = 1000000007; int r[105]; int w[2005]; int taken[105]; int hasTaken[2005]; signed main() { ios_base::sync_with_stdio(false); cin.tie(NULL); int n, m; cin >> n >> m; for(int i = 1; i <= n; i++) cin >> r[i]; for(int i = 1; i <= m; i++) cin >> w[i]; queue<int> q; int ans = 0; for(int t = 0; t < 2*m; t++) { int i; cin >> i; if(i > 0) { q.push(i); int j = q.front(); for(int i = 1; i <= n; i++) if(!taken[i]) { taken[i] = 1; hasTaken[j] = i; ans += r[i] * w[j]; q.pop(); break; } } else { i *= -1; taken[hasTaken[i]] = 0; hasTaken[i] = 0; if(!q.empty()) { int j = q.front(); for(int i = 1; i <= n; i++) if(!taken[i]) { taken[i] = 1; hasTaken[j] = i; ans += r[i] * w[j]; q.pop(); break; } } } } cout << ans << endl; }