import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        int[] a = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
        }

        int count = 0;
        for (int i = 0; i < n; i++) {
            for (int j = i; j < n; j++) {
                int sum = 0;
                for (int k = i; k <= j; k++) {
                    sum += a[k];
                }
                if (sum == 0) {
                    count++;
                }
            }
        }

        System.out.println(count);
    }
}