import java.util.*;
public class Main {
    public static void main(String[] args) {
        int arr[] ={10, 2, -2, -20, 10};
        int k = -10;
        HashMap<Integer,Integer>map = new HashMap<>();
        int cs = 0;int count =0;
        for(int i : arr){
            cs += i;
            int c = cs - k;
            if(cs == k){
                count++;
            }
            if(map.containsKey(c)){
                count += map.get(c);
            }
            map.put(cs, map.getOrDefault(cs,0)+1);
        }
        System.out.println(count);
    }
}

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