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    java

    import java.io.*;
    import java.util.*;
    
    public class Solution {
    
        public static void main(String[] args) {
           Scanner in=new Scanner(System.in);
           int n=in.nextInt();
           int[] arr=new int[n];
           for(int i=0;i<n;i++){
               arr[i]=in.nextInt();
           }
           int count=0;
           for(int i=0;i<n;i++){
               int sum=0;
               for(int j=i;j<n;j++){
                   sum=sum+arr[j];
                   if(sum<0){
                       count++;
                   }
               }
           }
           System.out.println(count);
           
        }
    }