import java.util.*;
class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
 
        int[] arr = new int[n+1];
        int[] prefix = new int[n +1];
        for (int i = 1; i <= n; i++) {
            arr[i] = sc.nextInt();
            prefix[i] = prefix[i - 1] + arr[i];
        }
 
        int c = 0;
        HashMap<Integer, Integer> map = new HashMap<>();
        map.put(0, 1);
 
        for (int j = 1; j <= n; j++) {
            int RHS= prefix[j] - j;
            c += map.getOrDefault(RHS, 0);
            map.put(RHS, map.getOrDefault(RHS, 0) + 1);
        }
 
        System.out.println(c);
    }
}
 

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