import java.util.*;

public class Solution {

    static Scanner sc = new Scanner(System.in);

    public static int mischievousChild(int N, int[] Child,int D, 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)
    	}

    	int[] separate = new int[N];

    	for(int i=0;i<N;i++) {
    		separate[i] = 10000000;
    	}

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

    	Queue<Integer> q = new LinkedList<>();

    	for(int i=0;i<N;i++) {
    		if(i==0){
                if(Child[i] == 1 && Child[i+1]==0){
                    q.add(i);
                }
            }
            else if(i==N-1){
                if(Child[i] == 1 && Child[i-1]==0){
                    q.add(i);
                }
            }
            else{
                if(Child[i]==1 && (Child[i+1]==0 || Child[i-1]==0)){
                    q.add(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.remove();

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

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

    	return ans;
    }

    public static void main(String[] args) {
    	int N;
        N = sc.nextInt();

        int[] Child = new int[N];

        for(int i=0;i<N;i++) {
        	Child[i] = sc.nextInt();
        }

        int D;
        D = sc.nextInt();

        int[] Day = new int[D];

        for(int i=0;i<D;i++) {
        	Day[i] = sc.nextInt();
        }


        System.out.println(mischievousChild(N,Child,D,Day));
    }
}