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    Scanner sc = new Scanner(System.in);

            int n = sc.nextInt();
        int arr[]= new int[n];
        for(int i=0;i<n;i++){
            int val = sc.nextInt();
            arr[i]=val;
        }
         int count =0;
        for(int i=0;i<n;i++){
    
           int sum=0;
    
            for(int j=i;j<n;j++){
                sum+=arr[j];
                if(sum<0){
                count++;
            }
            }
    
        }
        System.out.println(count);