import java.util.Scanner;
public class ScoreCheck {
public int solution(int n, int[] arr){
int answer = 0, tmp=1;
for (int i : arr) {
if(i==1){
answer+=tmp;
tmp++;
}
else {
tmp=1;
}
}
return answer;
}
public static void main(String[] args) {
ScoreCheck t = new ScoreCheck();
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] arr = new int[n];
for(int i=0;i