import java.io.BufferedReader;
import java.util.*;
import java.io.InputStreamReader;

public class Main {
	public static void main(String args[]) throws Exception
	{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());

		int a[];
		a = new int[n];
		Scanner scanner = new Scanner(System.in);
		for (int i = 0; i < n; i++) {
			a[i] = scanner.nextInt();
		}

		if (n == 1) {
		    if (a[0] == 0) {
		    	System.out.println(1 + "\n");
		    } else {
		    	System.out.println(0 + "\n");
		    }
			scanner.close();
		    return;
		}

		int c = 0;
		int sum = 0;
		for (int i = 0; i < n; i++) {
		    sum = a[i];
		    for (int j = i + 1; j < n; j++) {
		        sum = sum + a[j];
		        if (sum == 0) {
		            c++;
		        }
		    }
		}

    	System.out.println(c + "\n");
		scanner.close();
	}
}