public static void main(String[] args) { Scanner in = new Scanner(System.in); int largo_array = in.nextInt(); int array[] = new int[largo_array];

    for(int i = 0; i < largo_array; i++){
        array[i] = in.nextInt();
    }

    in.close();

    int count = 0;
    int suma;

    for(int j = 0; j < largo_array; j++){
        suma = array[j];
        if(suma < 0){
            count++;
        }
        for(int k = j + 1; k < largo_array; k++){
            suma+= array[k];
            if(suma < 0){
                count++;
            }
        }
    }

    System.out.println(count);
}