import java.io.*;

import java.util.*;

import java.util.stream.Stream;

public class Solution {

public static void main(String[] args) throws IOException {

/*

* Enter your code here. Read input from STDIN. Print output to STDOUT. Your

* class should be named Solution.

*/

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

int n = Integer.parseInt(bufferedReader.readLine().trim()); // length of the main array

int[] arr = new int[n];

String a = bufferedReader.readLine();

bufferedReader.close();

String[] vals = a.split(" ");

for (int i = 0; i < n; i++) {

arr[i] = Integer.parseInt(vals[i]);

// System.out.println(arr[i]);

}

int negCounter = 0;

for (int i = 0; i < arr.length; i++) {

for (int j = i; j < arr.length; j++) {

int sum = 0;

// For loop to print subarray elements

for (int k = i; k <= j; k++) {

sum += arr[k];

// System.out.print(arr[k] + " ");

// System.out.println("");

}

if (sum < 0) {

negCounter++;

}

}

}

System.out.println(negCounter);

// For loop for end index

}

}