#include <bits/stdc++.h> #define exoworldgd cin.tie(0)->sync_with_stdio(0),cout.tie(0) #define int long long using namespace std; int n,m,r[105],w[2005],p[2005],x,s=0,c,yes; bitset<105> t; signed main(void) { exoworldgd; queue<int> q; cin >> n >> m; for (int i = 0; i < n; i++) cin >> r[i]; for (int i = 1; i <= m; i++) cin >> w[i]; for (int i = 0; i < 2*m; i++) { cin >> x,yes=0; if (x>0) { for (int j = 0; j < n; j++) if (!t[j]) {t[j]=1, p[x]=j, s += r[j]*w[x], yes=1; break;} if(!yes) q.push(x); } else { x = -x, t[p[x]]=0; if (!q.empty()) c = q.front(), q.pop(), t[p[x]]=1, p[c]=p[x], s += r[p[c]]*w[c]; } } cout << s; }