#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
using namespace std;
using ll=long long;
#define rep(i,a,b) for (int i=(int)(a);i<(int)(b);i++)

//O(N log(N))

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int N;
	cin>>N;
	priority_queue<ll> pq;
	ll ans=0;
	string S;
	cin>>S;
	rep(i,0,N*2){
		ll a;
		cin>>a;
		if(S[i]=='('){
			ans+=a;
			pq.push(a);
		}
		else{
			pq.push(-a);
		}
		if(i%2==0){
			ans-=pq.top();
			pq.pop();
		}
	}
	cout<<ans<<"\n";
}