#include<bits/stdc++.h>
using namespace std;

int mischievousChild(int N, vector<int> &Child, int D, vector<int> &Day){
    for(int i=0;i<D;i++){
        Day[i]--;         // Because we are using 0 based indexing so changing children number from (1 to N) to (0 to N-1)
    }

    vector<int> separate(N,10000);  // To know that this guy was not separated by looking at the constraint initialise with a very large number.

    for(int i=0;i<D;i++){
        separate[Day[i]] = i;   // to keep count on what day was he separated so that we can decide whether he was changed or not changed before ith the day
    }

    queue<int> q;

    for(int i=0;i<N;i++){
        if(i==0){
            if(Child[i] == 1 && Child[i+1]==0){
                q.push(i);
            }
        }
        else if(i==N-1){
            if(Child[i] == 1 && Child[i-1]==0){
                q.push(i);
            }
        }
        else{
            if(Child[i]==1 && (Child[i+1]==0 || Child[i-1]==0)){
                q.push(i);     // if there is sequence like 1 1 1  the middle one is not contributing to the answer so excluded it.
            }
        }
    }


    for(int i=0;i<D;i++){
        if(q.size()==0){
            break;
        }
        else{
            int size = q.size();
            for(int j =0 ;j<size;j++){
                int tempChild = q.front();
                q.pop();

                if(tempChild>0 && Child[tempChild-1]==0 && separate[tempChild]>i){
                    Child[tempChild-1] = 1;
                    q.push(tempChild-1);
                }
                if(tempChild+1<N && Child[tempChild+1]==0 && separate[tempChild+1]>i){
                    Child[tempChild+1] = 1;
                    q.push(tempChild+1);
                }
            }
        }
    }

    int ans = 0;

    for(int i=0;i<N;i++){
        if(Child[i]==1)ans++;
    }

    return ans;
}

int main(){
    int N;
    cin>>N;
    vector<int> Child(N);
    for(int i=0;i<N;i++){
        cin>>Child[i];
    }
    int D;
    cin>>D;
    vector<int> Day(D);
    for(int i=0;i<D;i++){
        cin>>Day[i];
    }

    cout<<mischievousChild(N,Child,D,Day)<<endl;
}