import java.util.*; public class Main { public static int solution(int[] arr) { HashMap<Integer ,Integer > map = new HashMap<>(); map.put(0 , 1); int count =0; int sum =0 ; for(int i =0 ; i< arr.length ; i++){ sum += arr[i]; if(map.containsKey(sum)){ count += map.get(sum); } map.put(sum,map.getOrDefault(sum,0)+1); } return count; } public static void main(String[] args) { Scanner scn = new Scanner(System.in); int n = scn.nextInt(); int[] arr = new int[n]; for (int i = 0; i < n; i++) { arr[i] = scn.nextInt(); } System.out.println(solution(arr)); } }